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FL, USA
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Posted: 3/18/2014 7:27:50 PM EDT
[#1]
Quote HistoryOriginally Posted By cmcflex:
There is a difference between the "Mk18" and the "CQBR," the former will always have a M68 CCO in a Wilcox mount with LMT rear sight (as is my understanding). Quote HistoryOriginally Posted By cmcflex:
Originally Posted By m3racer:
Originally Posted By Max4Benelli:
Would there be any other optic I could use on a MK18 Mod O other than a Comp M2? Seriously? Su231 Su231a Su230 Ta01NSN Eotech 511 or 512 Or none at all There is a difference between the "Mk18" and the "CQBR," the former will always have a M68 CCO in a Wilcox mount with LMT rear sight (as is my understanding). This is correct, all had the LMT BUIS, and the only optic if any was the M2. William |
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Posted: 3/18/2014 7:51:31 PM EDT
[#2]
Quote HistoryOriginally Posted By Will816:
I think we get a pass on the DBAL either way... It's in the same category as the lower receiver. We're restricted by law in this case. Quote HistoryOriginally Posted By Will816:
Originally Posted By cschelk2:
Does anyone have any "in the wild" pics of a cqbr with a dbal? Thought I read its been seen but I haven't seen any pics. I think we get a pass on the DBAL either way... It's in the same category as the lower receiver. We're restricted by law in this case. I appreciate it. Not a fan of running a dummy peq for simply looks. |
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Posted: 3/18/2014 8:43:11 PM EDT
[#3]
Speaking of lasers - is the PEQ-15 VIS model still available for civilians?
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KS, USA
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Posted: 3/18/2014 8:54:24 PM EDT
[#4]
Quote HistoryOriginally Posted By m3racer:
Seriously? Su231 Su231a Su230 Ta01NSN Eotech 511 or 512 Or none at all Quote HistoryOriginally Posted By m3racer:
Originally Posted By Max4Benelli:
Would there be any other optic I could use on a MK18 Mod O other than a Comp M2? Seriously? Su231 Su231a Su230 Ta01NSN Eotech 511 or 512 Or none at all Well it was a serious question. Just looking for some help. All I saw listed was M2. • Barrel: 10.3 Colt Government profile with .70 gas port • Rail: Knights Armament M4 RAS • Muzzle Device: Knights Armament NT4 Flash Hider • Front Sight: A2 FSP • Rear Sight: LMT • Optic: Aimpoint CompM2 • Optic Mount: Wilcox • Stock: LMT SOPMOD Gen 1 Black • Grip: A1 • Light: Surefire M952 • Supressor: Knights Armament NT4 |
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Posted: 3/18/2014 9:01:03 PM EDT
[#5]
Quote HistoryOriginally Posted By Max4Benelli:
Well it was a serious question. Just looking for some help. All I saw listed was M2. • Barrel: 10.3 Colt Government profile with .70 gas port • Rail: Knights Armament M4 RAS • Muzzle Device: Knights Armament NT4 Flash Hider • Front Sight: A2 FSP • Rear Sight: LMT • Optic: Aimpoint CompM2 • Optic Mount: Wilcox • Stock: LMT SOPMOD Gen 1 Black • Grip: A1 • Light: Surefire M952 • Supressor: Knights Armament NT4 Quote HistoryOriginally Posted By Max4Benelli:
Originally Posted By m3racer:
Originally Posted By Max4Benelli:
Would there be any other optic I could use on a MK18 Mod O other than a Comp M2? Seriously? Su231 Su231a Su230 Ta01NSN Eotech 511 or 512 Or none at all Well it was a serious question. Just looking for some help. All I saw listed was M2. • Barrel: 10.3 Colt Government profile with .70 gas port • Rail: Knights Armament M4 RAS • Muzzle Device: Knights Armament NT4 Flash Hider • Front Sight: A2 FSP • Rear Sight: LMT • Optic: Aimpoint CompM2 • Optic Mount: Wilcox • Stock: LMT SOPMOD Gen 1 Black • Grip: A1 • Light: Surefire M952 • Supressor: Knights Armament NT4 Just about any optic available to the operator has been used. The M2 is the original optic chosen but it's not the only one. |
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Posted: 3/18/2014 9:03:16 PM EDT
[Last Edit: Advance]
[#6]
Quote HistoryOriginally Posted By wayfaerer320: Speaking of lasers - is the PEQ-15 VIS model still available for civilians? Edit: I doubt they have it but... http://www.maxprotactical.com/EOTech_Insight_ATPIAL_Illuminator_Laser_Aiming_p/eo-atp-000-a18vis.htm |
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Posted: 3/18/2014 9:13:26 PM EDT
[#7]
Quote HistoryOriginally Posted By bending_rodriguez:
 My wife would literally kill me.....were planning on a kitchen remodel....any extra cash has to go towards that right now Soon though hopefully
http://i58.tinypic.com/28bwv1c.jpg All of my clones...... The MOD 0 lower is pending. I'm considering stripping the M4 Block II and doing a Mk12 clone now.....Having the CQBR's pretty much makes the block II obsolete.....I think I'd rather have a bench/precision rifle. Quote HistoryOriginally Posted By bending_rodriguez:
Originally Posted By ECPrevatte:
Buy a new one. I just got the ball rolling on my Form 3 for the SOCOM.  Plus eFile should have it back by end of summer, much quicker.My wife would literally kill me.....were planning on a kitchen remodel....any extra cash has to go towards that right now Soon though hopefully
http://i58.tinypic.com/28bwv1c.jpg All of my clones...... The MOD 0 lower is pending. I'm considering stripping the M4 Block II and doing a Mk12 clone now.....Having the CQBR's pretty much makes the block II obsolete.....I think I'd rather have a bench/precision rifle. You need children... I'm getting jealous and that would seem to be the only way to stop you. Turn the M4 into a RECCE, bipod, glass, match barrel, upgraded trigger. It's a 16" barrel and I think 1/8 midlength is acceptable. Some good deals available on the barrel too, I love this thread. My SBR will never qualify tho. 11.5" and I can't get my self to pay that much for KAC buis. Carry on with the awesome please, and thank you all! |
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Posted: 3/18/2014 9:15:37 PM EDT
[#8]
Quote HistoryOriginally Posted By PFran42: Check out page 22 here: Quote HistoryOriginally Posted By PFran42: Originally Posted By wayfaerer320: Speaking of lasers - is the PEQ-15 VIS model still available for civilians? Edit: I doubt they have it but... http://www.maxprotactical.com/EOTech_Insight_ATPIAL_Illuminator_Laser_Aiming_p/eo-atp-000-a18vis.htm Thanks. |
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Posted: 3/18/2014 9:19:37 PM EDT
[#9]
Quote HistoryOriginally Posted By wayfaerer320: Quote HistoryOriginally Posted By wayfaerer320: Originally Posted By PFran42: Originally Posted By wayfaerer320: Speaking of lasers - is the PEQ-15 VIS model still available for civilians? Edit: I doubt they have it but... http://www.maxprotactical.com/EOTech_Insight_ATPIAL_Illuminator_Laser_Aiming_p/eo-atp-000-a18vis.htm Thanks. So tempting... |
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IN, USA
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Posted: 3/18/2014 9:21:44 PM EDT
[#10]
I'm not sure if I'm going to move my VIS over to the CQBR when I'm done, or leave it on the M4A1, and use a battery box. $700 is a lot for a laser, but it is cool to have though.
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Posted: 3/18/2014 9:24:09 PM EDT
[#11]
Quote HistoryOriginally Posted By wayfaerer320: Quote HistoryOriginally Posted By wayfaerer320: Originally Posted By wayfaerer320: Originally Posted By PFran42: Originally Posted By wayfaerer320: Speaking of lasers - is the PEQ-15 VIS model still available for civilians? Edit: I doubt they have it but... http://www.maxprotactical.com/EOTech_Insight_ATPIAL_Illuminator_Laser_Aiming_p/eo-atp-000-a18vis.htm Thanks. So tempting... The VIS model is identical in structure and housing, correct? The only differences are internal? I guess what I'm trying to say is, would this (the civilian VIS model) pass muster as a clone? |
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Posted: 3/18/2014 10:18:06 PM EDT
[#12]
How about asking in the lights and lasers forum instead of quoting yourself several times? Your questions have been answered before.
Pic thread: 
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NC, USA
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Posted: 3/18/2014 10:20:48 PM EDT
[Last Edit: PirateEC]
[#13]
One of my old issued guns:
One of my personal guns: 
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FL, USA
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Posted: 3/19/2014 12:20:57 AM EDT
[#15]
Quote HistoryOriginally Posted By warpig8654:
Just about any optic available to the operator has been used. The M2 is the original optic chosen but it's not the only one. Quote HistoryOriginally Posted By warpig8654:
Originally Posted By Max4Benelli:
Originally Posted By m3racer:
Originally Posted By Max4Benelli:
Would there be any other optic I could use on a MK18 Mod O other than a Comp M2? Seriously? Su231 Su231a Su230 Ta01NSN Eotech 511 or 512 Or none at all Well it was a serious question. Just looking for some help. All I saw listed was M2. • Barrel: 10.3 Colt Government profile with .70 gas port • Rail: Knights Armament M4 RAS • Muzzle Device: Knights Armament NT4 Flash Hider • Front Sight: A2 FSP • Rear Sight: LMT • Optic: Aimpoint CompM2 • Optic Mount: Wilcox • Stock: LMT SOPMOD Gen 1 Black • Grip: A1 • Light: Surefire M952 • Supressor: Knights Armament NT4 Just about any optic available to the operator has been used. The M2 is the original optic chosen but it's not the only one. Being former VBSS, myself nor any of my former team were ever called nor would we ever call our selves operators. We also had no choice in optic with the Mk18 Mod0, it was always a CompM2 in a WilcoX mount and BUIS was LMT. Illumination was a Surefire 962, and thats it. We also rocked Mossberg 500's some with surefire for end, and M9's as our last resort. We had no special equipment or patches, a quick two week course in San Diego and we were ships company VBSS. That's it... William |
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Posted: 3/19/2014 12:23:29 AM EDT
[#16]
Quote HistoryOriginally Posted By PirateEC: One of my old issued guns: https://imagizer.imageshack.us/v2/604x453q90/824/mk18range066.jpg One of my personal guns: https://imagizer.imageshack.us/v2/862x453q90/36/ov81.jpg Looks great.
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Posted: 3/19/2014 12:25:43 AM EDT
[Last Edit: wayfaerer320]
[#17]
I really dig this guy's upper - makes me want an SU-231A even more:
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Posted: 3/19/2014 12:54:03 AM EDT
[#18]
Quote HistoryOriginally Posted By Tmender03:
I'm not sure if I'm going to move my VIS over to the CQBR when I'm done, or leave it on the M4A1, and use a battery box. $700 is a lot for a laser, but it is cool to have though. $700? Is this a mil/LE discount? |
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GA, USA
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Posted: 3/19/2014 12:57:07 AM EDT
[Last Edit: karmapolice]
[#19]
disregard, not worth the trouble
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TX, USA
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Posted: 3/19/2014 1:11:03 AM EDT
[#20]
Im back! After much thought I just couldn't get rid of my mk18, I knew I would regret it. I just got the ta31 in for it. I think it will make a great general purpose rifle.
hdr_1395205034426 by tb5252, on Flickr |
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Posted: 3/19/2014 1:21:29 AM EDT
[#21]
Quote HistoryOriginally Posted By TannerB:
Im back! After much thought I just couldn't get rid of my mk18, I knew I would regret it. I just got the ta31 in for it. I think it will make a great general purpose rifle. [email=http://www.flickr.com/photos/99028180@N02/13259270344/]http://farm8.staticflickr.com/7194/13259270344_e1b82aacb9_z.jpg[/email] hdr_1395205034426 by tb5252, on Flickr Well played. I understand some parting with Block IIs due to their weight, but parting with a CQBR just doesn't add up to me. 
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Posted: 3/19/2014 1:21:48 AM EDT
[#22]
M4A1 SOPMOD CQBR Block 1.5s (PR):     |
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Posted: 3/19/2014 1:23:55 AM EDT
[#23]
Nice shot of a CQBR Block II:
 |
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IN, USA
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Posted: 3/19/2014 5:14:10 AM EDT
[#24]
Quote HistoryOriginally Posted By Will816:
$700? Is this a mil/LE discount? Quote HistoryOriginally Posted By Will816:
Originally Posted By Tmender03:
I'm not sure if I'm going to move my VIS over to the CQBR when I'm done, or leave it on the M4A1, and use a battery box. $700 is a lot for a laser, but it is cool to have though. $700? Is this a mil/LE discount? Yes, directly from Insight. |
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ID, USA
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Posted: 3/19/2014 11:21:12 AM EDT
[#25]
Quote HistoryOriginally Posted By karmapolice:
disregard, not worth the trouble I think I kmow what you're talking about. |
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PA, USA
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Posted: 3/19/2014 12:17:58 PM EDT
[Last Edit: markhateen]
[#26]
VBSS classic pic kind of a "caption this" moment 
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Posted: 3/19/2014 2:05:28 PM EDT
[#27]
Quote HistoryOriginally Posted By Splittiebus66:
http://img84.imageshack.us/img84/3659/mk182cj5.jpg VBSS classic pic kind of a "caption this" moment Yeah, he's saying, "Hey man, can we get some f-ing mags over here?"
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TX, USA
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Posted: 3/19/2014 2:12:43 PM EDT
[Last Edit: Andrew9869]
[#28]
delete
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Posted: 3/19/2014 2:26:41 PM EDT
[#29]
Paul Rudd and Aarron Hernandez in that picture.
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FL, USA
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Posted: 3/19/2014 3:50:51 PM EDT
[#30]
Quote HistoryOriginally Posted By ECPrevatte:
Paul Rudd and Aarron Hernandez in that picture. LMAO |
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Posted: 3/19/2014 5:24:37 PM EDT
[#31]
Quote HistoryOriginally Posted By m3racer:
me too: (excuse the aac mount) http://i6.photobucket.com/albums/y218/gw4k/firearms/BBC8C63F-F760-4CA8-A611-797879E9BB0D_zpsvs8tjlcc.jpg i pretty much ran through all the combos of mk18/ cqbr and m4a1 block 2. Quote HistoryOriginally Posted By m3racer:
Originally Posted By AstraPat:
First time I've seen this one.. Me gusto the block 1.5! me too: (excuse the aac mount) http://i6.photobucket.com/albums/y218/gw4k/firearms/BBC8C63F-F760-4CA8-A611-797879E9BB0D_zpsvs8tjlcc.jpg i pretty much ran through all the combos of mk18/ cqbr and m4a1 block 2. M3racer how much of the 553 front mount clasp is hanging off the front of the upper receiver? Is it pretty secure? |
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FL, USA
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Posted: 3/19/2014 5:28:18 PM EDT
[#32]
Quote HistoryOriginally Posted By M4A1:
M3racer how much of the 553 front mount clasp is hanging off the front of the upper receiver? Is it pretty secure? Quote HistoryOriginally Posted By M4A1:
Originally Posted By m3racer:
Originally Posted By AstraPat:
First time I've seen this one.. Me gusto the block 1.5! me too: (excuse the aac mount) http://i6.photobucket.com/albums/y218/gw4k/firearms/BBC8C63F-F760-4CA8-A611-797879E9BB0D_zpsvs8tjlcc.jpg i pretty much ran through all the combos of mk18/ cqbr and m4a1 block 2. M3racer how much of the 553 front mount clasp is hanging off the front of the upper receiver? Is it pretty secure? its secure, the main clamp is all on the receiver. |
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Posted: 3/19/2014 5:30:47 PM EDT
[#33]
Quote HistoryOriginally Posted By m3racer:
its secure, the main clamp is all on the receiver. Quote HistoryOriginally Posted By m3racer:
Originally Posted By M4A1:
Originally Posted By m3racer:
Originally Posted By AstraPat:
First time I've seen this one.. Me gusto the block 1.5! me too: (excuse the aac mount) http://i6.photobucket.com/albums/y218/gw4k/firearms/BBC8C63F-F760-4CA8-A611-797879E9BB0D_zpsvs8tjlcc.jpg i pretty much ran through all the combos of mk18/ cqbr and m4a1 block 2. M3racer how much of the 553 front mount clasp is hanging off the front of the upper receiver? Is it pretty secure? its secure, the main clamp is all on the receiver.
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USA
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Posted: 3/19/2014 8:07:22 PM EDT
[#34]
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Posted: 3/19/2014 9:08:52 PM EDT
[#35]
Quote HistoryOriginally Posted By cmcflex:
http://25.media.tumblr.com/0c36cc84dfd40b1ff3e3609f922517c5/tumblr_mry5klcT661rgw5pgo1_1280.jpg Is it true this light is being discontinued? If so what will replace it? |
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IN, USA
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Posted: 3/19/2014 9:10:56 PM EDT
[#36]
Quote HistoryOriginally Posted By M4A1:
Is it true this light is being discontinued? If so what will replace it? Quote HistoryOriginally Posted By M4A1:
Originally Posted By cmcflex:
http://25.media.tumblr.com/0c36cc84dfd40b1ff3e3609f922517c5/tumblr_mry5klcT661rgw5pgo1_1280.jpg Is it true this light is being discontinued? If so what will replace it? Not discontinued. EOTech won't be distributing Insight lights anymore. You can still buy them direct from Insight. |
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IN, USA
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Posted: 3/19/2014 9:11:26 PM EDT
[#37]
Quote HistoryOriginally Posted By cmcflex:
http://25.media.tumblr.com/0c36cc84dfd40b1ff3e3609f922517c5/tumblr_mry5klcT661rgw5pgo1_1280.jpg Needs more MRDS and less Docter. |
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TN, USA
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Posted: 3/19/2014 9:23:39 PM EDT
[Last Edit: Dr_Boolets]
[#38]
Hello! I've joined AR15 forums just to make this post and in the future, interact with other users and learn more about the growing subject on the AR15 rifle.
That said here are my main questions for the moment, but before we get to that here are some details: Said rifle I am talking about is a Colt 6920. I want to turn this into a Mk18.. err M4A1 Block II CQBR. To my understanding the specs are (as listed on page one) are 10.3" Barrel, and a gas port opened up to 0.070. Okay now what I'm really trying to get to: According to some other users, there is a company, ADCO Firearms, LLC, who can do some modifications to my barrel. Assuming this is a complete list, please correct me if I need to add another service or drop one.
*- should I choose to pin a GB, would I have to send in my choice of one or would they provide one? As well as should I request a double pin or would it be unnecessary? Edit: If I were to send in just the barrel in, would I need to worry about putting my rifle back together with proper headspace? Or could I just slap it back together with the rail? I'm considering buying the DD rail and sending it in with the upper and paying the extra 50 buck fee but I was just curious about this as well. |
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Posted: 3/19/2014 9:31:50 PM EDT
[#39]
Quote HistoryOriginally Posted By Dr_Boolets:
Hello! I've joined AR15 forums just to make this post and in the future, interact with other users and learn more about the growing subject on the AR15 rifle. That said here are my main questions for the moment, but before we get to that here are some details: Said rifle I am talking about is a Colt 6920. I want to turn this into a Mk18.. err M4A1 Block II CQBR. To my understanding the specs are (as listed on page one) are 10.3" Barrel, and a gas port opened up to 0.070. Okay now what I'm really trying to get to: According to some other users, there is a company, ADCO Firearms, LLC, who can do some modifications to my barrel. Assuming this is a complete list, please correct me if I need to add another service or drop one.
*- should I choose to pin a GB, would I have to send in my choice of one or would they provide one? As well as should I request a double pin or would it be unnecessary? I think ADCO rolls cut, crown, and gas port enlargement into one item. Just so that you are aware, there is a significant legal hurdle you have to jump in order to own a rifle with a barrel that is shorter than 16", and depending on how you approach this it could take anywhere from 4-12 months before you can do what you want to do, and you also need to pay a $200 federal tax. A little demon called the National Firearms Act. Go check out the SBR subforum to get acquainted with what you'll have to do. |
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Posted: 3/19/2014 9:43:55 PM EDT
[#40]
Quote HistoryOriginally Posted By Will816:
[ I think ADCO rolls cut, crown, and gas port enlargement into one item Yes sir. I am getting ready to send out my M4 barrel for its 12.5 shortening. Steve confirmed this for me. |
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TN, USA
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Posted: 3/19/2014 9:44:16 PM EDT
[#41]
Quote HistoryOriginally Posted By Will816:
I think ADCO rolls cut, crown, and gas port enlargement into one item. Just so that you are aware, there is a significant legal hurdle you have to jump in order to own a rifle with a barrel that is shorter than 16", and depending on how you approach this it could take anywhere from 4-12 months before you can do what you want to do, and you also need to pay a $200 federal tax. A little demon called the National Firearms Act. Go check out the SBR subforum to get acquainted with what you'll have to do. Quote HistoryOriginally Posted By Will816:
Originally Posted By Dr_Boolets:
Hello! I've joined AR15 forums just to make this post and in the future, interact with other users and learn more about the growing subject on the AR15 rifle. That said here are my main questions for the moment, but before we get to that here are some details: Said rifle I am talking about is a Colt 6920. I want to turn this into a Mk18.. err M4A1 Block II CQBR. To my understanding the specs are (as listed on page one) are 10.3" Barrel, and a gas port opened up to 0.070. Okay now what I'm really trying to get to: According to some other users, there is a company, ADCO Firearms, LLC, who can do some modifications to my barrel. Assuming this is a complete list, please correct me if I need to add another service or drop one.
*- should I choose to pin a GB, would I have to send in my choice of one or would they provide one? As well as should I request a double pin or would it be unnecessary? I think ADCO rolls cut, crown, and gas port enlargement into one item. Just so that you are aware, there is a significant legal hurdle you have to jump in order to own a rifle with a barrel that is shorter than 16", and depending on how you approach this it could take anywhere from 4-12 months before you can do what you want to do, and you also need to pay a $200 federal tax. A little demon called the National Firearms Act. Go check out the SBR subforum to get acquainted with what you'll have to do. Yeah, I'm aware of the NFA, I'm really now just scratching the surface of things regarding weapon modification in regards to engineering as well as those tricky hurdles I need to jump. I don't want to be the bloke to steer this thread off course so if you don't mind could you give me a short explanation of how I can drastically cut the time it takes to get my tax stamp? Regardless I will check out all I need to know on the NFA forums. |
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AZ, USA
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Posted: 3/19/2014 9:45:24 PM EDT
[#42]
Quote HistoryOriginally Posted By Will816:
I think ADCO rolls cut, crown, and gas port enlargement into one item. Just so that you are aware, there is a significant legal hurdle you have to jump in order to own a rifle with a barrel that is shorter than 16", and depending on how you approach this it could take anywhere from 4-12 months before you can do what you want to do, and you also need to pay a $200 federal tax. A little demon called the National Firearms Act. Go check out the SBR subforum to get acquainted with what you'll have to do. Quote HistoryOriginally Posted By Will816:
Originally Posted By Dr_Boolets:
Hello! I've joined AR15 forums just to make this post and in the future, interact with other users and learn more about the growing subject on the AR15 rifle. That said here are my main questions for the moment, but before we get to that here are some details: Said rifle I am talking about is a Colt 6920. I want to turn this into a Mk18.. err M4A1 Block II CQBR. To my understanding the specs are (as listed on page one) are 10.3" Barrel, and a gas port opened up to 0.070. Okay now what I'm really trying to get to: According to some other users, there is a company, ADCO Firearms, LLC, who can do some modifications to my barrel. Assuming this is a complete list, please correct me if I need to add another service or drop one.
*- should I choose to pin a GB, would I have to send in my choice of one or would they provide one? As well as should I request a double pin or would it be unnecessary? I think ADCO rolls cut, crown, and gas port enlargement into one item. Just so that you are aware, there is a significant legal hurdle you have to jump in order to own a rifle with a barrel that is shorter than 16", and depending on how you approach this it could take anywhere from 4-12 months before you can do what you want to do, and you also need to pay a $200 federal tax. A little demon called the National Firearms Act. Go check out the SBR subforum to get acquainted with what you'll have to do. Additionally, that gas port size is optimized for M855 or similar ammo. I don't know what ammo you use; therefore, you should be aware that when companies like Daniel Defense sell similar barrels, they use a slightly larger gas port in case customers want to shoot cheaper ammo. Before you build this, I would highly suggest reading the entire 400 something page MK18 thread that just got shut down. It could save you from costly mistakes and help you plan out your accessories. Hope that helps
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TN, USA
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Posted: 3/19/2014 9:54:01 PM EDT
[Last Edit: Dr_Boolets]
[#43]
Quote HistoryOriginally Posted By Thunder79:
Additionally, that gas port size is optimized for M855 or similar ammo. I don't know what ammo you use; therefore, you should be aware that when companies like Daniel Defense sell similar barrels, they use a slightly larger gas port in case customers want to shoot cheaper ammo. Before you build this, I would highly suggest reading the entire 400 something page MK18 thread that just got shut down. It could save you from costly mistakes and help you plan out your accessories. Hope that helps
Quote HistoryOriginally Posted By Thunder79:
Originally Posted By Will816:
Originally Posted By Dr_Boolets:
Hello! I've joined AR15 forums just to make this post and in the future, interact with other users and learn more about the growing subject on the AR15 rifle. That said here are my main questions for the moment, but before we get to that here are some details: Said rifle I am talking about is a Colt 6920. I want to turn this into a Mk18.. err M4A1 Block II CQBR. To my understanding the specs are (as listed on page one) are 10.3" Barrel, and a gas port opened up to 0.070. Okay now what I'm really trying to get to: According to some other users, there is a company, ADCO Firearms, LLC, who can do some modifications to my barrel. Assuming this is a complete list, please correct me if I need to add another service or drop one.
*- should I choose to pin a GB, would I have to send in my choice of one or would they provide one? As well as should I request a double pin or would it be unnecessary? I think ADCO rolls cut, crown, and gas port enlargement into one item. Just so that you are aware, there is a significant legal hurdle you have to jump in order to own a rifle with a barrel that is shorter than 16", and depending on how you approach this it could take anywhere from 4-12 months before you can do what you want to do, and you also need to pay a $200 federal tax. A little demon called the National Firearms Act. Go check out the SBR subforum to get acquainted with what you'll have to do. Additionally, that gas port size is optimized for M855 or similar ammo. I don't know what ammo you use; therefore, you should be aware that when companies like Daniel Defense sell similar barrels, they use a slightly larger gas port in case customers want to shoot cheaper ammo. Before you build this, I would highly suggest reading the entire 400 something page MK18 thread that just got shut down. It could save you from costly mistakes and help you plan out your accessories. Hope that helps
I read some 190 pages of it, mostly arguments leading up to the shit storm stirred up over some dudes Tungsten cerakoted "clone." I honestly didn't find much in regards to gas port correlation with size and ammo. I did however see that a gas port opened up to 0.070 did cycle alright with an H buffer and TULA steelshit ammo. Others were talking about rumors regarding a 0.080 port size but I never found anything on that. EDIT-What I should be saying is that I train with what .223 I can find which is usually TULA or Federal, but on duty (Private security, for the record I am not prior military) I use 5.56 XM193 ammo. because all I really need to do is rezero optics. |
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GA, USA
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Posted: 3/19/2014 10:00:46 PM EDT
[#44]
I measured the gas port on a DD 10.3" barrel just last week on the upper I built for karmapolice (the one he posted with the DDC Geissele MK2). It was .082. He's running it with an H2 and it's 100% so far. I have a DD factory MK18 gun and it came with an "H" buffer. It's been 100% over almost 1000 rounds including suppressed and full-auto/suppressed fire. It's a 2011 built gun, but I assume the gas port is the same size.
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Posted: 3/19/2014 10:05:37 PM EDT
[#45]
Quote HistoryOriginally Posted By ASH556:
I measured the gas port on a DD 10.3" barrel just last week on the upper I built for karmapolice (the one he posted with the DDC Geissele MK2). It was .082. He's running it with an H2 and it's 100% so far. I have a DD factory MK18 gun and it came with an "H" buffer. It's been 100% over almost 1000 rounds including suppressed and full-auto/suppressed fire. It's a 2011 built gun, but I assume the gas port is the same size. I was under the understanding that DD uses a pretty large gasport. |
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TN, USA
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Posted: 3/19/2014 10:08:57 PM EDT
[#46]
Quote HistoryOriginally Posted By ASH556:
I measured the gas port on a DD 10.3" barrel just last week on the upper I built for karmapolice (the one he posted with the DDC Geissele MK2). It was .082. He's running it with an H2 and it's 100% so far. I have a DD factory MK18 gun and it came with an "H" buffer. It's been 100% over almost 1000 rounds including suppressed and full-auto/suppressed fire. It's a 2011 built gun, but I assume the gas port is the same size. Finally! Thank you. I've been trying to get a straight answer to this (though I never asked) question. I'll probably go with the 0.070 for now then if I don't like it or things aren't working suppressed or not I can enlarge it. |
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Posted: 3/19/2014 10:29:23 PM EDT
[#47]
Quote HistoryOriginally Posted By Dr_Boolets: Finally! Thank you. I've been trying to get a straight answer to this (though I never asked) question. I'll probably go with the 0.070 for now then if I don't like it or things aren't working suppressed or not I can enlarge it. Quote HistoryOriginally Posted By Dr_Boolets: Originally Posted By ASH556: I measured the gas port on a DD 10.3" barrel just last week on the upper I built for karmapolice (the one he posted with the DDC Geissele MK2). It was .082. He's running it with an H2 and it's 100% so far. I have a DD factory MK18 gun and it came with an "H" buffer. It's been 100% over almost 1000 rounds including suppressed and full-auto/suppressed fire. It's a 2011 built gun, but I assume the gas port is the same size. Finally! Thank you. I've been trying to get a straight answer to this (though I never asked) question. I'll probably go with the 0.070 for now then if I don't like it or things aren't working suppressed or not I can enlarge it. FYI - I'm using a standard carbine buffer with my DD MK18 upper and it's been 100% reliable. I should note this is with PMC 55gr, but again, with the standard carbine buffer it's not given me any trouble at all.
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AZ, USA
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Posted: 3/19/2014 10:35:10 PM EDT
[#48]
Quote HistoryOriginally Posted By Dr_Boolets:
I read some 190 pages of it, mostly arguments leading up to the shit storm stirred up over some dudes Tungsten cerakoted "clone." I honestly didn't find much in regards to gas port correlation with size and ammo. I did however see that a gas port opened up to 0.070 did cycle alright with an H buffer and TULA steelshit ammo. Others were talking about rumors regarding a 0.080 port size but I never found anything on that. EDIT-What I should be saying is that I train with what .223 I can find which is usually TULA or Federal, but on duty (Private security, for the record I am not prior military) I use 5.56 XM193 ammo. because all I really need to do is rezero optics. Quote HistoryOriginally Posted By Dr_Boolets:
Originally Posted By Thunder79:
Originally Posted By Will816:
Originally Posted By Dr_Boolets:
Hello! I've joined AR15 forums just to make this post and in the future, interact with other users and learn more about the growing subject on the AR15 rifle. That said here are my main questions for the moment, but before we get to that here are some details: Said rifle I am talking about is a Colt 6920. I want to turn this into a Mk18.. err M4A1 Block II CQBR. To my understanding the specs are (as listed on page one) are 10.3" Barrel, and a gas port opened up to 0.070. Okay now what I'm really trying to get to: According to some other users, there is a company, ADCO Firearms, LLC, who can do some modifications to my barrel. Assuming this is a complete list, please correct me if I need to add another service or drop one.
*- should I choose to pin a GB, would I have to send in my choice of one or would they provide one? As well as should I request a double pin or would it be unnecessary? I think ADCO rolls cut, crown, and gas port enlargement into one item. Just so that you are aware, there is a significant legal hurdle you have to jump in order to own a rifle with a barrel that is shorter than 16", and depending on how you approach this it could take anywhere from 4-12 months before you can do what you want to do, and you also need to pay a $200 federal tax. A little demon called the National Firearms Act. Go check out the SBR subforum to get acquainted with what you'll have to do. Additionally, that gas port size is optimized for M855 or similar ammo. I don't know what ammo you use; therefore, you should be aware that when companies like Daniel Defense sell similar barrels, they use a slightly larger gas port in case customers want to shoot cheaper ammo. Before you build this, I would highly suggest reading the entire 400 something page MK18 thread that just got shut down. It could save you from costly mistakes and help you plan out your accessories. Hope that helps
I read some 190 pages of it, mostly arguments leading up to the shit storm stirred up over some dudes Tungsten cerakoted "clone." I honestly didn't find much in regards to gas port correlation with size and ammo. I did however see that a gas port opened up to 0.070 did cycle alright with an H buffer and TULA steelshit ammo. Others were talking about rumors regarding a 0.080 port size but I never found anything on that. EDIT-What I should be saying is that I train with what .223 I can find which is usually TULA or Federal, but on duty (Private security, for the record I am not prior military) I use 5.56 XM193 ammo. because all I really need to do is rezero optics. Sent you an IM |
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Posted: 3/20/2014 1:14:04 AM EDT
[#49]
Three 10.3" all factory DD CQBRs between me and a range buddy. We have run H2s in all three of them since round one. Thousands of rounds of PMC Bronze and 62 grain XTac between them - both suppressed and unsuppressed, and 100 percent flawless to date.
I always opt to run the heaviest buffer that will yield 100 percent reliability in any and all of my ARs. And with suppressed fire in particular, and the 10.3" barrel, I'm positive I could step up to an H3 and still get 100 percent reliability. |
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TX, USA
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Posted: 3/20/2014 1:15:42 AM EDT
[#50]
Zeroed both today. Just fyi mine runs with an h2 or carbine buffer both suppressed and not suppressed. I have an lmt upper too.
IMG_20140320_000750 by tb5252, on Flickr |
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