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Posted: 3/16/2021 9:07:51 PM EST
[#1]
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Posted: 3/16/2021 9:24:11 PM EST
[#2]
Correct colt-ambi safety came in.... it does turn 360 degrees now due to no selector stops lol
 
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DC, USA
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Posted: 3/16/2021 9:32:58 PM EST
[#3]
Quote HistoryOriginally Posted By wissota4: Correct on left, hotdog on right Quote HistoryOriginally Posted By wissota4: Originally Posted By Air_Soft_Contractor: Select fire ambi on left, semi-auto ambi on right. https://i.ibb.co/Cnk2y6X/DSCN0062a.jpg Correct on left, hotdog on right Yes, I do have a ambi semi or two with the correct profile too. |
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Posted: 3/16/2021 10:06:22 PM EST
[#4]
Quote HistoryOriginally Posted By -KentuckyWindage-: MAWL’s  https://www.ar15.com/media/mediaFiles/490874/9971AE69-52EE-4DC5-A72B-8FF4265877BA_jpe-1855964.JPG LMT MRP on the left and BCM MLOK on left. |
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Posted: 3/16/2021 10:10:43 PM EST
[#5]
Quote HistoryOriginally Posted By MALICIOUS2551: LMT MRP on the left and BCM MLOK on left. Well ain’t that some shit, I missed the mrp, nice catch 
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Posted: 3/16/2021 10:30:29 PM EST
[#6]
Quote HistoryOriginally Posted By LsuJon: Correct colt-ambi safety came in.... it does turn 360 degrees now due to no selector stops lol https://i.imgur.com/phSthue.jpg https://i.imgur.com/Xo8kUUe.jpg Lol I found that out too. I filled the upper half channel with JB Weld to prevent from going all the way around. Time will tell if it holds up.  Correct fix would be getting an 80%er with Colt markings. 
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Posted: 3/16/2021 10:32:10 PM EST
[#7]
Quote HistoryOriginally Posted By 2Keylows: Lol I found that out too. I filled the upper half channel with JB Weld to prevent from going all the way around. Time will tell if it holds up. Correct fix would be getting an 80%er with Colt markings. |
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Posted: 3/16/2021 10:41:37 PM EST
[#8]
Quote HistoryOriginally Posted By LsuJon: Really would like to do an 80%, however I'm to much of a protectionist that I wouldn't be happy w/ my milling skills or lack there of I'll admit that's what's keeping me back as well. Trashing a perfectly marked lower would be pretty depressing. |
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Posted: 3/16/2021 11:04:24 PM EST
[#9]
Quote HistoryOriginally Posted By LsuJon: Really would like to do an 80%, however I'm to much of a protectionist that I wouldn't be happy w/ my milling skills or lack there of Ocd makes me want to redo lowers non stop. They still work though.. |
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CA, USA
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Posted: 3/16/2021 11:56:50 PM EST
[#10]
Quote HistoryOriginally Posted By 2Keylows: I'll admit that's what's keeping me back as well. Trashing a perfectly marked lower would be pretty depressing. Don’t make me pull out and photograph my raw 80% clone lowers... |
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Posted: 3/17/2021 12:02:11 AM EST
[#11]
My M4A1 lower should arrive soon (PSA, please be gentle) and I was curious: in your experience, what's my best option for a barrel? I'm wanting the stripped Colt 10.3 (going for a non FSB build) and I see they're available for backorder via Brownells. I have no problem placing a backorder, as this will be a slow build over time, but what time frame are we looking at? I just don't want to spend the money on a backorder that may never be filled.
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Posted: 3/17/2021 2:57:27 AM EST
[#12]
Quote HistoryOriginally Posted By AZgunner: My M4A1 lower should arrive soon (PSA, please be gentle) and I was curious: in your experience, what's my best option for a barrel? I'm wanting the stripped Colt 10.3 (going for a non FSB build) and I see they're available for backorder via Brownells. I have no problem placing a backorder, as this will be a slow build over time, but what time frame are we looking at? I just don't want to spend the money on a backorder that may never be filled. Colts (Govt profile) are clone correct as is FN (SOCOM). There are reported some DD barrels but I've never seen them. Can't answer on Brownell's backorder. Remember Colt was just sold to CZ, but haven't heard of any supply stoppages. CD |
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Posted: 3/17/2021 3:02:27 AM EST
[#13]
For those wondering about the mk18 upper/gas block from Brownells, I'll let you know this Thursday when it arrives.
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Posted: 3/17/2021 7:07:44 AM EST
[#14]
Quote HistoryOriginally Posted By Combat_Diver: Colts (Govt profile) are clone correct as is FN (SOCOM). There are reported some DD barrels but I've never seen them. Can't answer on Brownell's backorder. Remember Colt was just sold to CZ, but haven't heard of any supply stoppages. CD Quote HistoryOriginally Posted By Combat_Diver: Originally Posted By AZgunner: My M4A1 lower should arrive soon (PSA, please be gentle) and I was curious: in your experience, what's my best option for a barrel? I'm wanting the stripped Colt 10.3 (going for a non FSB build) and I see they're available for backorder via Brownells. I have no problem placing a backorder, as this will be a slow build over time, but what time frame are we looking at? I just don't want to spend the money on a backorder that may never be filled. Colts (Govt profile) are clone correct as is FN (SOCOM). There are reported some DD barrels but I've never seen them. Can't answer on Brownell's backorder. Remember Colt was just sold to CZ, but haven't heard of any supply stoppages. CD The factory stripped 10.3" he's looking at was not used as far as I know. |
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Posted: 3/17/2021 7:28:46 AM EST
[Last Edit: Combat_Diver]
[#15]
Quote HistoryOriginally Posted By pezboytate: The factory stripped 10.3" he's looking at was not used as far as I know. Yeah, didn't catch that part but remember Crane cut down 14.5" w/FSB, so a 10.3" Gov't profile will have drilled taper pin holes. Then again gas block is going to cover up one of the TP holes. Still closer clone then 10.5" bbls.  Attached FileCD |
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Posted: 3/17/2021 7:48:12 AM EST
[#16]
Quote HistoryOriginally Posted By Spitfire75: Don’t make me pull out and photograph my raw 80% clone lowers...  Attached File |
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Posted: 3/17/2021 7:58:12 AM EST
[Last Edit: Dyzastr]
[#17]
Originally Posted By Spitfire75: Don't make me pull out and photograph my raw 80% clone lowers... Originally Posted By AZgunner: My M4A1 lower should arrive soon (PSA, please be gentle) and I was curious: in your experience, what's my best option for a barrel? I'm wanting the stripped Colt 10.3 (going for a non FSB build) and I see they're available for backorder via Brownells. I have no problem placing a backorder, as this will be a slow build over time, but what time frame are we looking at? I just don't want to spend the money on a backorder that may never be filled. |
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Posted: 3/17/2021 11:57:24 AM EST
[#18]
Quote HistoryOriginally Posted By js1977: For those wondering about the mk18 upper/gas block from Brownells, I'll let you know this Thursday when it arrives.
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Posted: 3/17/2021 1:19:12 PM EST
[#19]
Quote HistoryOriginally Posted By Spitfire75: Don’t make me pull out and photograph my raw 80% clone lowers... Motivate me.  
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DC, USA
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Posted: 3/17/2021 2:46:08 PM EST
[#20]
Quote HistoryOriginally Posted By Combat_Diver: Yeah, didn't catch that part but remember Crane cut down 14.5" w/FSB, so a 10.3" Gov't profile will have drilled taper pin holes. Then again gas block is going to cover up one of the TP holes. Still closer clone then 10.5" bbls. https://www.ar15.com/media/mediaFiles/32677/barrel_IMG_4690_JPG-1868801.JPG CD I did get a chance to compare my Colt, FN and Daniel Defense 10.3" barrels out of receivers and the Colt and FN are the same length, but most of the Daniel Defense barrels are slightly shorter, but I did find one that is really close. |
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Posted: 3/17/2021 3:28:56 PM EST
[#21]
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MO, USA
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Posted: 3/17/2021 4:15:24 PM EST
[#22]
Quote HistoryOriginally Posted By LsuJon: Really would like to do an 80%, however I'm to much of a protectionist that I wouldn't be happy w/ my milling skills or lack there of Finding someone to do the engravings has been extremely hard. The last person I asked said that some alphabet agency raided his shop with guns drawn just because he was engraving Colt logos. He's still in business and engraves everything else, just no Colt. |
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WA, USA
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Posted: 3/17/2021 5:12:49 PM EST
[#23]
Quote HistoryOriginally Posted By blindrocket: Finding someone to do the engravings has been extremely hard. The last person I asked said that some alphabet agency raided his shop with guns drawn just because he was engraving Colt logos. He's still in business and engraves everything else, just no Colt. John Brace did a phenomenal job engraving my 80% last month. He doesn't do Colt either, but he did FN M4 markings for me, which is a decent alternative. Combat Diver posted photos of the M4 markings a few weeks ago. But then I bought a Colt M4 marked lower for AU the other day so now I have both
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Posted: 3/17/2021 5:17:40 PM EST
[#24]
Quote HistoryOriginally Posted By LsuJon: Decided to clean the CQBR after 1k rounds suppressed just to check the wear. No where near some of you guys (looking at you KRDT  ). https://www.ar15.com/media/mediaFiles/316069/0148E23F-2384-47AD-A655-B7574A24FF54_jpe-1865636.JPGhttps://www.ar15.com/media/mediaFiles/316069/658B7118-956B-43F7-95F8-C799129317C5_jpe-1865637.JPGhttps://www.ar15.com/media/mediaFiles/316069/F5B2F23A-56DC-4A2B-B017-343DCA8894C5_jpe-1865640.JPG Quote HistoryOriginally Posted By LsuJon: Decided to clean the CQBR after 1k rounds suppressed just to check the wear. No where near some of you guys (looking at you KRDT ). https://www.ar15.com/media/mediaFiles/316069/0148E23F-2384-47AD-A655-B7574A24FF54_jpe-1865636.JPGhttps://www.ar15.com/media/mediaFiles/316069/658B7118-956B-43F7-95F8-C799129317C5_jpe-1865637.JPGhttps://www.ar15.com/media/mediaFiles/316069/F5B2F23A-56DC-4A2B-B017-343DCA8894C5_jpe-1865640.JPG Lol... gettin' there, gettin' there. Gotta keep it going 'til the upper starts looking like a carbon frosted cupcake and you can scoop it out with a spoon :D. Haven't pushed up past 3k since the last time I posted pics, but it's sitting at 1800rds currently, so ya never know. I thought about cleaning after the last trip but buttering it up with more 000 grease is just a lot easier, lol. Originally Posted By Air_Soft_Contractor: I clean mine the same day as shooting. A friend left his sit overnight after shooting PMC ammo and it seized up the action. Overnight, eh? Just gonna leave these here...  Attached File Attached File Attached FileAnd she was still running both suppressed and unsuppressed with shit Wolf steel case. CQBR strong like bull. If I had to guess, your buddy probably runs it too dry. Gotta lube dat puppy up. |
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Posted: 3/17/2021 5:34:05 PM EST
[#25]
Quote HistoryOriginally Posted By krdt: Lol... gettin' there, gettin' there. Gotta keep it going 'til the upper starts looking like a carbon frosted cupcake and you can scoop it out with a spoon :D. Haven't pushed up past 3k since the last time I posted pics, but it's sitting at 1800rds currently, so ya never know. I thought about cleaning after the last trip but buttering it up with more 000 grease is just a lot easier, lol. Overnight, eh? Just gonna leave these here... https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-06_jpg-1868757.JPG https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-07_jpg-1868758.JPG https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-10_jpg-1868759.JPG And she was still running both suppressed and unsuppressed with shit Wolf steel case. CQBR strong like bull. If I had to guess, your buddy probably runs it too dry. Gotta lube dat puppy up. This post needs a like. |
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Posted: 3/17/2021 5:47:57 PM EST
[#26]
Quote HistoryOriginally Posted By krdt: Lol... gettin' there, gettin' there. Gotta keep it going 'til the upper starts looking like a carbon frosted cupcake and you can scoop it out with a spoon :D. Haven't pushed up past 3k since the last time I posted pics, but it's sitting at 1800rds currently, so ya never know. I thought about cleaning after the last trip but buttering it up with more 000 grease is just a lot easier, lol. Overnight, eh? Just gonna leave these here... https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-06_jpg-1868757.JPG https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-07_jpg-1868758.JPG https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-10_jpg-1868759.JPG And she was still running both suppressed and unsuppressed with shit Wolf steel case. CQBR strong like bull. If I had to guess, your buddy probably runs it too dry. Gotta lube dat puppy up. Quote HistoryOriginally Posted By krdt: Originally Posted By LsuJon: Decided to clean the CQBR after 1k rounds suppressed just to check the wear. No where near some of you guys (looking at you KRDT ). https://www.ar15.com/media/mediaFiles/316069/0148E23F-2384-47AD-A655-B7574A24FF54_jpe-1865636.JPGhttps://www.ar15.com/media/mediaFiles/316069/658B7118-956B-43F7-95F8-C799129317C5_jpe-1865637.JPGhttps://www.ar15.com/media/mediaFiles/316069/F5B2F23A-56DC-4A2B-B017-343DCA8894C5_jpe-1865640.JPG Lol... gettin' there, gettin' there. Gotta keep it going 'til the upper starts looking like a carbon frosted cupcake and you can scoop it out with a spoon :D. Haven't pushed up past 3k since the last time I posted pics, but it's sitting at 1800rds currently, so ya never know. I thought about cleaning after the last trip but buttering it up with more 000 grease is just a lot easier, lol. Originally Posted By Air_Soft_Contractor: I clean mine the same day as shooting. A friend left his sit overnight after shooting PMC ammo and it seized up the action. Overnight, eh? Just gonna leave these here... https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-06_jpg-1868757.JPG https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-07_jpg-1868758.JPG https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-10_jpg-1868759.JPG And she was still running both suppressed and unsuppressed with shit Wolf steel case. CQBR strong like bull. If I had to guess, your buddy probably runs it too dry. Gotta lube dat puppy up. I'm fairly certain my OCD would not let me sleep until that had been cleaned... |
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Posted: 3/17/2021 5:59:53 PM EST
[#27]
Quote HistoryOriginally Posted By krdt: Lol... gettin' there, gettin' there. Gotta keep it going 'til the upper starts looking like a carbon frosted cupcake and you can scoop it out with a spoon :D. Haven't pushed up past 3k since the last time I posted pics, but it's sitting at 1800rds currently, so ya never know. I thought about cleaning after the last trip but buttering it up with more 000 grease is just a lot easier, lol. Overnight, eh? Just gonna leave these here... https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-06_jpg-1868757.JPG https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-07_jpg-1868758.JPG https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-10_jpg-1868759.JPG And she was still running both suppressed and unsuppressed with shit Wolf steel case. CQBR strong like bull. If I had to guess, your buddy probably runs it too dry. Gotta lube dat puppy up. I almost wanna throw my hand in there to clean it. |
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Posted: 3/17/2021 6:04:39 PM EST
[Last Edit: Dyzastr]
[#28]
Quote HistoryOriginally Posted By blindrocket: Finding someone to do the engravings has been extremely hard. The last person I asked said that some alphabet agency raided his shop with guns drawn just because he was engraving Colt logos. He's still in business and engraves everything else, just no Colt. Quote HistoryOriginally Posted By blindrocket: Originally Posted By LsuJon: Really would like to do an 80%, however I'm to much of a protectionist that I wouldn't be happy w/ my milling skills or lack there of Finding someone to do the engravings has been extremely hard. The last person I asked said that some alphabet agency raided his shop with guns drawn just because he was engraving Colt logos. He's still in business and engraves everything else, just no Colt. Pics  Attached File Attached File |
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DC, USA
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Posted: 3/17/2021 8:51:37 PM EST
[Last Edit: Air_Soft_Contractor]
[#29]
Well of my 10.3" Daniel Defense barrels, it looks only one of them is as long and the same length as the Colt and FN barrels, but it is the same.
The other DD 10.3" barrels seem a bit shorter for some reason. DD on top, Colt in the middle and FN on the bottom. 
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Posted: 3/17/2021 9:41:01 PM EST
[#30]
Quote HistoryOriginally Posted By mdavis: I'm fairly certain my OCD would not let me sleep until that had been cleaned... Quote HistoryOriginally Posted By mdavis: Originally Posted By krdt: Originally Posted By LsuJon: Decided to clean the CQBR after 1k rounds suppressed just to check the wear. No where near some of you guys (looking at you KRDT ). https://www.ar15.com/media/mediaFiles/316069/0148E23F-2384-47AD-A655-B7574A24FF54_jpe-1865636.JPGhttps://www.ar15.com/media/mediaFiles/316069/658B7118-956B-43F7-95F8-C799129317C5_jpe-1865637.JPGhttps://www.ar15.com/media/mediaFiles/316069/F5B2F23A-56DC-4A2B-B017-343DCA8894C5_jpe-1865640.JPG Lol... gettin' there, gettin' there. Gotta keep it going 'til the upper starts looking like a carbon frosted cupcake and you can scoop it out with a spoon :D. Haven't pushed up past 3k since the last time I posted pics, but it's sitting at 1800rds currently, so ya never know. I thought about cleaning after the last trip but buttering it up with more 000 grease is just a lot easier, lol. Originally Posted By Air_Soft_Contractor: I clean mine the same day as shooting. A friend left his sit overnight after shooting PMC ammo and it seized up the action. Overnight, eh? Just gonna leave these here... https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-06_jpg-1868757.JPG https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-07_jpg-1868758.JPG https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-10_jpg-1868759.JPG And she was still running both suppressed and unsuppressed with shit Wolf steel case. CQBR strong like bull. If I had to guess, your buddy probably runs it too dry. Gotta lube dat puppy up. I'm fairly certain my OCD would not let me sleep until that had been cleaned... Yeah, I used to be pretty diligent about regular cleaning myself -- when I initially started going to higher and higher round counts, it was mostly just out of entertainment/curiosity and as a reliability test type of deal. However, in the process, you end up starting to push your own "CQBR Overton window" further and further, and pretty soon what seemed extreme just seems normal. The first time I went above 1k, that seemed excessive... but then the next time it was just "eh." Before long it was 1.5k, then 2k, then 3k, and so on... lol. Each time it gets that much easier to reach the same point again and go further. In the meantime, going 1k-2k between cleanings doesn't really seem weird anymore. |
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Posted: 3/17/2021 9:44:13 PM EST
[#31]
Originally Posted By krdt: Lol... gettin' there, gettin' there. Gotta keep it going 'til the upper starts looking like a carbon frosted cupcake and you can scoop it out with a spoon :D. Haven't pushed up past 3k since the last time I posted pics, but it's sitting at 1800rds currently, so ya never know. I thought about cleaning after the last trip but buttering it up with more 000 grease is just a lot easier, lol. Overnight, eh? Just gonna leave these here... https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-06_jpg-1868757.JPG https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-07_jpg-1868758.JPG https://www.ar15.com/media/mediaFiles/72167/CQBR_121419_Carbon_Bukkake-URG-RS-10_jpg-1868759.JPG And she was still running both suppressed and unsuppressed with shit Wolf steel case. CQBR strong like bull. If I had to guess, your buddy probably runs it too dry. Gotta lube dat puppy up. I finally saw these pics on a bigger screen. Is your gas tube completely blocked up? The pic that shows the end of the gas tube makes it appear as though the tube is packed with grimy goodness. Originally Posted By Air_Soft_Contractor: Well of my 10.3" Daniel Defense barrels, it looks only one of them is as long and the same length as the Colt and FN barrels, but it is the same. The other DD 10.3" barrels seem a bit shorter for some reason. DD on top, Colt in the middle and FN on the bottom. https://i.ibb.co/HC0rNy5/DSCN0069.jpg Dang, how many 10.3'' barrels you got? |
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DC, USA
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Posted: 3/17/2021 9:49:11 PM EST
[#32]
Quote HistoryOriginally Posted By Dyzastr: I finally saw these pics on a bigger screen. Is your gas tube completely blocked up? The pic that shows the end of the gas tube makes it appear as though the tube is packed with grimy goodness. Dang, how many 10.3'' barrels you got? I'm not sure. I have stripped and FSB ones. |
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Posted: 3/17/2021 9:56:59 PM EST
[#33]
Quote HistoryOriginally Posted By Air_Soft_Contractor: I'm not sure. I have stripped and FSB ones. |
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DC, USA
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Posted: 3/17/2021 10:11:00 PM EST
[#34]
Quote HistoryOriginally Posted By Dyzastr: are you a dealer, or collector? I'm a hobbyist. Here are some of the unbuilt FSB 10.3" barrels awaiting M4 RIS and M4 RAS handguards. 
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DC, USA
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Posted: 3/17/2021 10:41:54 PM EST
[#35]
In the mid-1980's I was involved in a project to improve reliability of 10" barrel AR's.
There weren't a lot of buffer weights or hydraulic buffers, but our big break came when Colt came out with the 9mm and it's two-piece buffer. It weighs about the same as an H3 buffer. Later, the one-piece 9mm buffer didn't work as well for 5.56, compared with the original two-piece 9mm buffer. So we were buying all of the two-piece 9mm buffers we could. Years later, with nitride barrels, we fired continuous full auto, heating the barrels. The 14.5" nitride turned white from the heat. The 10.5" nitride barrel stayed black, as much of the heat exited the muzzle with the blast, before it could heat the barrel as much. We figured a heavy barrel wasn't as much benefit with a short barrel, as far as dissipating heat, because much of the heat was just leaving through the muzzle. |
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Posted: 3/17/2021 10:44:15 PM EST
[#36]
Quote HistoryOriginally Posted By pezboytate: The factory stripped 10.3" he's looking at was not used as far as I know. Quote HistoryOriginally Posted By pezboytate: Originally Posted By Combat_Diver: Originally Posted By AZgunner: My M4A1 lower should arrive soon (PSA, please be gentle) and I was curious: in your experience, what's my best option for a barrel? I'm wanting the stripped Colt 10.3 (going for a non FSB build) and I see they're available for backorder via Brownells. I have no problem placing a backorder, as this will be a slow build over time, but what time frame are we looking at? I just don't want to spend the money on a backorder that may never be filled. Colts (Govt profile) are clone correct as is FN (SOCOM). There are reported some DD barrels but I've never seen them. Can't answer on Brownell's backorder. Remember Colt was just sold to CZ, but haven't heard of any supply stoppages. CD The factory stripped 10.3" he's looking at was not used as far as I know. So all actual MK18s are made from cut down 14.5 barrels? Would the stripped 10.3 Colt barrel at least be the right gas port size? I want a clone, within reason. I'm sure I'll get kicked out of the thread, but I'm not super worried about it being a factory 10.3 vs a cut down as long as the gas port is the correct size. |
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MO, USA
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Posted: 3/17/2021 11:28:45 PM EST
[#37]
Talk about barrels and also high round counts, when could one expect to shoot out a barrel? I've thought about having a spare 10.3" on hand but I honestly don't see myself shooting my MK18 so much that I ruin the barrel.
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Posted: 3/18/2021 12:47:40 AM EST
[Last Edit: MILSPEC556]
[#38]
Quote HistoryOriginally Posted By blindrocket: Talk about barrels and also high round counts, when could one expect to shoot out a barrel? I've thought about having a spare 10.3" on hand but I honestly don't see myself shooting my MK18 so much that I ruin the barrel. General rule of thumb is 20k rounds with a good barrel. But this is kind of a farce because more than anything it depends on firing schedule (most specifically, the amount of heat you’re putting into it at any given time) You could get 10K rounds out of a barrel slinging lead on full auto all the time, where as the same exact barrel could get twice or more that, with a slower ROF and allowing it to cool. If that makes sense. Heat kills barrels sooner than high round count does. |
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Posted: 3/18/2021 1:17:27 AM EST
[#39]
Originally Posted By Air_Soft_Contractor: In the mid-1980's I was involved in a project to improve reliability of 10" barrel AR's. There weren't a lot of buffer weights or hydraulic buffers, but our big break came when Colt came out with the 9mm and it's two-piece buffer. It weighs about the same as an H3 buffer. Later, the one-piece 9mm buffer didn't work as well for 5.56, compared with the original two-piece 9mm buffer. So we were buying all of the two-piece 9mm buffers we could. Years later, with nitride barrels, we fired continuous full auto, heating the barrels. The 14.5" nitride turned white from the heat. The 10.5" nitride barrel stayed black, as much of the heat exited the muzzle with the blast, before it could heat the barrel as much. We figured a heavy barrel wasn't as much benefit with a short barrel, as far as dissipating heat, because much of the heat was just leaving through the muzzle. Originally Posted By AZgunner: So all actual MK18s are made from cut down 14.5 barrels? Would the stripped 10.3 Colt barrel at least be the right gas port size? I want a clone, within reason. I'm sure I'll get kicked out of the thread, but I'm not super worried about it being a factory 10.3 vs a cut down as long as the gas port is the correct size. |
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CA, USA
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Posted: 3/18/2021 2:49:06 AM EST
[#40]
Quote HistoryOriginally Posted By wissota4: /media/mediaFiles/sharedAlbum/tumblr_lka9rhi8aT1qadbq2o1_400_GIF-121.gif I’ve posted these before, but I just snapped these about an hour ago. I practiced milling out a few lowers that I hadn’t engraved, kind of for practice and to get the feel for my router and jig. I think I’m comfortable enough with the process that I can start milling out these clone lowers. The only problem is with the retro A1 style lowers. NoDak doesn’t drill the stepped safety selector detent hole, so I’m going to have to do that on my own...with a hand drill. We’ll see how it goes and I hope I don’t fuck them up. I was probably one of Braceman’s final customers to get Colt engravings, and that makes me sad. And thankful. Sorry about the glare in the engravings; the lighting in my garage can be tricky sometimes.   
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Posted: 3/18/2021 4:15:37 AM EST
[#41]
Quote HistoryOriginally Posted By Dyzastr: I finally saw these pics on a bigger screen. Is your gas tube completely blocked up? The pic that shows the end of the gas tube makes it appear as though the tube is packed with grimy goodness. Quote HistoryOriginally Posted By Dyzastr: I finally saw these pics on a bigger screen. Is your gas tube completely blocked up? The pic that shows the end of the gas tube makes it appear as though the tube is packed with grimy goodness. Yeah, those pics were taken right at the end of life for my previous barrel, when it was starting to keyhole at a bit below 17k. When I pulled it apart, the gas tube was probably 90%+ clogged and I couldn't even blow air through it, heh. Didn't have any effect on function, though. Gives you a pretty good appreciation for just how much gas pressure is running through that tube -- I couldn't even blow air through it, yet it was able to cycle even that filthy and unsuppressed. Oh, did I mention my gas rings had the same round count and were worn smooth with the bolt flange? Lol. Didn't actually replace those gas rings until 20k, either. No issues, just 20k seemed a good round number. Hell, I could probably run it without gas rings at all. I think it's pretty safe to say I don't have any reliability concerns when it comes to the RC host CQBR, lol. Originally Posted By blindrocket: Talk about barrels and also high round counts, when could one expect to shoot out a barrel? I've thought about having a spare 10.3" on hand but I honestly don't see myself shooting my MK18 so much that I ruin the barrel. As mentioned above, I got a little under 17k out of my last DD barrel; but, around 14k of that was steel case. The current barrel has only had quality copper jacketed reloads through it, and I expect I'll get 20k or better. |
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Posted: 3/18/2021 7:22:14 AM EST
[Last Edit: Dyzastr]
[#42]
Quote HistoryOriginally Posted By krdt: Yeah, those pics were taken right at the end of life for my previous barrel, when it was starting to keyhole at a bit below 17k. When I pulled it apart, the gas tube was probably 90%+ clogged and I couldn't even blow air through it, heh. Didn't have any effect on function, though. Gives you a pretty good appreciation for just how much gas pressure is running through that tube -- I couldn't even blow air through it, yet it was able to cycle even that filthy and unsuppressed. Oh, did I mention my gas rings had the same round count and were worn smooth with the bolt flange? Lol. Didn't actually replace those gas rings until 20k, either. No issues, just 20k seemed a good round number. Hell, I could probably run it without gas rings at all. I think it's pretty safe to say I don't have any reliability concerns when it comes to the RC host CQBR, lol. As mentioned above, I got a little under 17k out of my last DD barrel; but, around 14k of that was steel case. The current barrel has only had quality copper jacketed reloads through it, and I expect I'll get 20k or better. Quote HistoryOriginally Posted By krdt: Originally Posted By Dyzastr: I finally saw these pics on a bigger screen. Is your gas tube completely blocked up? The pic that shows the end of the gas tube makes it appear as though the tube is packed with grimy goodness. Yeah, those pics were taken right at the end of life for my previous barrel, when it was starting to keyhole at a bit below 17k. When I pulled it apart, the gas tube was probably 90%+ clogged and I couldn't even blow air through it, heh. Didn't have any effect on function, though. Gives you a pretty good appreciation for just how much gas pressure is running through that tube -- I couldn't even blow air through it, yet it was able to cycle even that filthy and unsuppressed. Oh, did I mention my gas rings had the same round count and were worn smooth with the bolt flange? Lol. Didn't actually replace those gas rings until 20k, either. No issues, just 20k seemed a good round number. Hell, I could probably run it without gas rings at all. I think it's pretty safe to say I don't have any reliability concerns when it comes to the RC host CQBR, lol. Originally Posted By blindrocket: Talk about barrels and also high round counts, when could one expect to shoot out a barrel? I've thought about having a spare 10.3" on hand but I honestly don't see myself shooting my MK18 so much that I ruin the barrel. As mentioned above, I got a little under 17k out of my last DD barrel; but, around 14k of that was steel case. The current barrel has only had quality copper jacketed reloads through it, and I expect I'll get 20k or better. |
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Posted: 3/18/2021 7:26:20 AM EST
[#43]
Quote HistoryOriginally Posted By AZgunner: So all actual MK18s are made from cut down 14.5 barrels? Would the stripped 10.3 Colt barrel at least be the right gas port size? I want a clone, within reason. I'm sure I'll get kicked out of the thread, but I'm not super worried about it being a factory 10.3 vs a cut down as long as the gas port is the correct size. Quote HistoryOriginally Posted By AZgunner: Originally Posted By pezboytate: Originally Posted By Combat_Diver: Originally Posted By AZgunner: My M4A1 lower should arrive soon (PSA, please be gentle) and I was curious: in your experience, what's my best option for a barrel? I'm wanting the stripped Colt 10.3 (going for a non FSB build) and I see they're available for backorder via Brownells. I have no problem placing a backorder, as this will be a slow build over time, but what time frame are we looking at? I just don't want to spend the money on a backorder that may never be filled. Colts (Govt profile) are clone correct as is FN (SOCOM). There are reported some DD barrels but I've never seen them. Can't answer on Brownell's backorder. Remember Colt was just sold to CZ, but haven't heard of any supply stoppages. CD The factory stripped 10.3" he's looking at was not used as far as I know. So all actual MK18s are made from cut down 14.5 barrels? Would the stripped 10.3 Colt barrel at least be the right gas port size? I want a clone, within reason. I'm sure I'll get kicked out of the thread, but I'm not super worried about it being a factory 10.3 vs a cut down as long as the gas port is the correct size. Yes, M4 barrel with FSB removed and cut down. Also DD 10.3" barrel with Mk12 gas block and stripped FN 10.3" "SOCOM" barrel. The factory Colt stripped barrel does have the correct gas port size but is a slightly different length (likely undetectable), slightly different profile just before the gas block (it is unnoticeable to most people and under the handguards), and doesn't have the taper pin holes (also under the handguard). In a way, the factory stripped 10.3" DD barrel is more correct than the factory stripped 10.3" Colt barrel. I don't know why everyone in here likes the 10.3" Colt barrels so much. Just buy an M4 barrel and have it cut down. Just make sure it's cut to the correct length and drilled for the correct gas port size. |
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DC, USA
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Posted: 3/18/2021 8:09:26 AM EST
[#44]
Quote HistoryOriginally Posted By pezboytate: Yes, M4 barrel with FSB removed and cut down. Also DD 10.3" barrel with Mk12 gas block and stripped FN 10.3" "SOCOM" barrel. The factory Colt stripped barrel does have the correct gas port size but is a slightly different length (likely undetectable), slightly different profile just before the gas block (it is unnoticeable to most people and under the handguards), and doesn't have the taper pin holes (also under the handguard). In a way, the factory stripped 10.3" DD barrel is more correct than the factory stripped 10.3" Colt barrel. I don't know why everyone in here likes the 10.3" Colt barrels so much. Just buy an M4 barrel and have it cut down. Just make sure it's cut to the correct length and drilled for the correct gas port size. I haven't gaged them, but just from eyeballing them (might be finish tone), the 10.3" Colt gas port, "looks" slightly larger than the 10.3" FN gas port. |
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AR, USA
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Posted: 3/18/2021 9:07:23 AM EST
[Last Edit: 762hunter2]
[#45]
Emissary Development posted some pics of their hand brakes in use with USASOC
  
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USA
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Posted: 3/18/2021 9:13:40 AM EST
[#46]
Quote HistoryOriginally Posted By Spitfire75: I’ve posted these before, but I just snapped these about an hour ago. I practiced milling out a few lowers that I hadn’t engraved, kind of for practice and to get the feel for my router and jig. I think I’m comfortable enough with the process that I can start milling out these clone lowers. The only problem is with the retro A1 style lowers. NoDak doesn’t drill the stepped safety selector detent hole, so I’m going to have to do that on my own...with a hand drill. We’ll see how it goes and I hope I don’t fuck them up. I was probably one of Braceman’s final customers to get Colt engravings, and that makes me sad. And thankful. Sorry about the glare in the engravings; the lighting in my garage can be tricky sometimes. https://i.imgur.com/FI1D41O.jpg https://i.imgur.com/5hkuaOX.jpg https://i.imgur.com/sbf9oS9.jpg Those are nice! Did you buy them pre-engraved or do it yourself? |
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MO, USA
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Posted: 3/18/2021 10:35:44 AM EST
[#47]
Thanks for the replies on barrels. Maybe I should have a spare for the future. I found a new DD 10.3 for $310 but that seems a little high TBH
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Posted: 3/18/2021 11:09:45 AM EST
[#48]
Quote HistoryOriginally Posted By Spitfire75: I’ve posted these before, but I just snapped these about an hour ago. I practiced milling out a few lowers that I hadn’t engraved, kind of for practice and to get the feel for my router and jig. I think I’m comfortable enough with the process that I can start milling out these clone lowers. The only problem is with the retro A1 style lowers. NoDak doesn’t drill the stepped safety selector detent hole, so I’m going to have to do that on my own...with a hand drill. We’ll see how it goes and I hope I don’t fuck them up. I was probably one of Braceman’s final customers to get Colt engravings, and that makes me sad. And thankful. Sorry about the glare in the engravings; the lighting in my garage can be tricky sometimes. https://i.imgur.com/FI1D41O.jpg https://i.imgur.com/5hkuaOX.jpg https://i.imgur.com/sbf9oS9.jpg I wouldnt hand drill anything lol |
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CA, USA
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Posted: 3/18/2021 12:15:32 PM EST
[#49]
Quote HistoryOriginally Posted By daylapaul: Those are nice! Did you buy them pre-engraved or do it yourself? I sent them out to Braceman back in 2018 when he was still doing Colt engraving. Since he’s no longer doing Colt engraving, I’ve been hesitant to mill these out because I don’t want to make any mistakes. |
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CA, USA
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Posted: 3/18/2021 12:27:05 PM EST
[#50]
Quote HistoryOriginally Posted By wissota4: I wouldnt hand drill anything lol One of my “practice” 80% lowers had a selector detent hole that wasn’t drilled deep enough when I received it. The 0.125” hole was drilled properly but the 0.188” hole was too shallow. I tried to finish it out by eyeballing it and I ended up going all the way through. Whoopsie...that’s why it was a practice lower. The selector still functions, but the detent will go all the way through the hole and fall out if I remove the selector. I will actually have to measure things with a caliper if I try it again in the future. |
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