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Posted: 11/4/2021 9:24:08 PM EST
[#1]
Quote HistoryQuoted: Just finished assembling my m5 lower. Added a FDe b5 grip and stock. The lower parts kit bag had roll pin and 4-40 set screw left over. Is that normal? Not sure where the 4-40 screws is used. I assume the roll pin is used if you don’t want to use the threaded screw. https://i.ibb.co/LCKYjvd/83-FD3200-53-CF-4779-8503-7-C073-CDB5-EBE.jpg london photos free download The tiny set screw can be used to retain the detent spring for the rear takedown pin, the hole is already threaded. I trim a few coils off the spring to avoid coil bind. |
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Posted: 11/4/2021 10:42:22 PM EST
[#2]
Quote HistoryQuoted: The tiny set screw can be used to retain the detent spring for the rear takedown pin, the hole is already threaded. I trim a few coils off the spring to avoid coil bind. Yeah, I had to trim about 1/8th" before installing the set screw. |
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Posted: 11/7/2021 2:36:07 PM EST
[#3]
Here is my SR-25 super knockoff.
 Attached File |
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Posted: 11/8/2021 10:45:15 AM EST
[#4]
Quote HistoryQuoted: Here is my SR-25 super knockoff. https://www.ar15.com/media/mediaFiles/500629/E5ACCA91-A579-46BA-823C-D324913640B4_jpe-2158370.JPG That’s basically what I wanted to do with mine, but that rail is so expensive. 
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Posted: 11/8/2021 5:06:01 PM EST
[#5]
Quote HistoryQuoted: That’s basically what I wanted to do with mine, but that rail is so expensive. I have contemplated selling the rail and changing to a URX4 but the old school ff ras is just so cool. |
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Posted: 11/9/2021 4:00:21 PM EST
[#6]
Which gas tube do I need for the M5 build? Rifle length gas BA 6.5 creedmoor barrel.
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Posted: 11/9/2021 5:11:55 PM EST
[#7]
Quote HistoryQuoted: Which gas tube do I need for the M5 build? Rifle length gas BA 6.5 creedmoor barrel. BA uses AR-15 gas tubes for their 308/6.5M DMPS barrels. not Armalite AR-10. |
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Posted: 11/9/2021 6:26:53 PM EST
[#8]
Quote HistoryQuoted: BA uses AR-15 gas tubes for their 308/6.5M DMPS barrels. not Armalite AR-10. I believe I read that the AR-15 tubes were too short? |
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Posted: 11/9/2021 6:39:40 PM EST
[#9]
Quote HistoryQuoted: BA uses AR-15 gas tubes for their 308/6.5M DMPS barrels. not Armalite AR-10. This. See here too for some info on some setups that use the weird armalite length tubes: https://www.ar15.com/forums/ar-15/AR308---Incorrect-Gas-Tube-Length-/121-763130/ |
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Posted: 11/9/2021 6:54:49 PM EST
[#10]
Quote HistoryQuoted: This. See here too for some info on some setups that use the weird armalite length tubes: https://www.ar15.com/forums/ar-15/AR308---Incorrect-Gas-Tube-Length-/121-763130/ Excellent info, thank you! |
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Posted: 11/14/2021 5:40:14 PM EST
[#11]
I keep going back and forth on rails. The two I’m going between are the Aero Atlas R-One and the SLR 308h ion lite. I’m leaning towards the SLR because it’s 1” longer and doesn’t use timing shims on the barrel nut (not sure shims are a big deal but I’m after accuracy). The R-one has a couple things going for it. I can get it color matched to my upper and lower so no painting to match. Then it’s also $150 or so less expensive.
For those with the R-One, how solid is it? This is a big heavy build and I don’t want it flexing or moving around. Thanks |
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Posted: 11/14/2021 9:29:09 PM EST
[#12]
Quote HistoryQuoted: I keep going back and forth on rails. The two I’m going between are the Aero Atlas R-One and the SLR 308h ion lite. I’m leaning towards the SLR because it’s 1” longer and doesn’t use timing shims on the barrel nut (not sure shims are a big deal but I’m after accuracy). The R-one has a couple things going for it. I can get it color matched to my upper and lower so no painting to match. Then it’s also $150 or so less expensive. For those with the R-One, how solid is it? This is a big heavy build and I don’t want it flexing or moving around. Thanks Rone is plenty solid. I generally dislike aero rails because of having to shim all of them to time. That said after going through the exercise of getting shims and getting it aligned I am happy with it. |
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Posted: 11/15/2021 11:02:46 AM EST
[#13]
Quote HistoryQuoted: Rone is plenty solid. I generally dislike aero rails because of having to shim all of them to time. That said after going through the exercise of getting shims and getting it aligned I am happy with it. Well shit! Looks like the Superlative Arms clamp on gas block will not fit under the Aero rail. I'm pretty set on this gas block and mounting style. Guess I'll have to keep thinking it all over. I was all set to run and grab one I saw locally. ETA: It looks like the SLR adjustable gas block would run under the Aero M5 R-one rail but there isn't a ton of clearance. Gas Block: 1.4" Rail: 1.5" Is that cutting it too close? Any chance I could get someone to measure the inside of the M5 R-One rail top to bottom? |
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Posted: 11/21/2021 12:43:13 AM EST
[#14]
Has anyone used the vltor RE10 system on there builds?
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Posted: 11/21/2021 1:12:11 AM EST
[#15]
Quote HistoryQuoted: Has anyone used the vltor RE10 system on there builds? The RE10 is functionally the same as a intermediate, or A5, length RE. The difference is the number of stock position holes and less threaded length. Armalite uses the intermediate length RE for their AR-10 adjustable stock rifles. Magpul UBR uses a proprietary intermediate length RE. KAC SR25/M110 also use that length. I have not used the RE10, but have used intermediate length RE's . |
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Posted: 11/21/2021 2:42:47 AM EST
[#16]
Quote HistoryQuoted: Has anyone used the vltor RE10 system on there builds? The Vltor RE10 is the same as the Vltor A5 except the RE10 gas only 6 positions compared to 7 on the A5. I use a RE10 with a Heavybuffers.com XH buffer with his 308 spring in my 12.5in 308. I use a RE10 and a H2 buffer in my 16in 308. |
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Posted: 11/21/2021 2:57:29 AM EST
[#17]
Quote HistoryQuoted: Well shit! Looks like the Superlative Arms clamp on gas block will not fit under the Aero rail. I'm pretty set on this gas block and mounting style. Guess I'll have to keep thinking it all over. I was all set to run and grab one I saw locally. ETA: It looks like the SLR adjustable gas block would run under the Aero M5 R-one rail but there isn't a ton of clearance. Gas Block: 1.4" Rail: 1.5" Is that cutting it too close? Any chance I could get someone to measure the inside of the M5 R-One rail top to bottom? Quote HistoryQuoted: Quoted: Rone is plenty solid. I generally dislike aero rails because of having to shim all of them to time. That said after going through the exercise of getting shims and getting it aligned I am happy with it. Well shit! Looks like the Superlative Arms clamp on gas block will not fit under the Aero rail. I'm pretty set on this gas block and mounting style. Guess I'll have to keep thinking it all over. I was all set to run and grab one I saw locally. ETA: It looks like the SLR adjustable gas block would run under the Aero M5 R-one rail but there isn't a ton of clearance. Gas Block: 1.4" Rail: 1.5" Is that cutting it too close? Any chance I could get someone to measure the inside of the M5 R-One rail top to bottom? I have the standard Aero rail and my Superlative Arms clamp on adjustable gas block fit fine. 
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Posted: 11/21/2021 10:33:16 AM EST
[#18]
Im running a 16 inch build and am contemplating going to the intermediate length loke the A5
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Posted: 11/21/2021 12:08:46 PM EST
[#19]
Quote HistoryQuoted: I have the standard Aero rail and my Superlative Arms clamp on adjustable gas block fit fine. https://i.imgur.com/HpVnXGK.jpeg The R-one is a slim rail. Yours uses the BAR barrel nut interface and your rail is large enough to tuck a suppressor. |
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Posted: 11/21/2021 1:06:53 PM EST
[#20]
Quote HistoryQuoted: The RE10 is functionally the same as a intermediate, or A5, length RE. The difference is the number of stock position holes and less threaded length. Armalite uses the intermediate length RE for their AR-10 adjustable stock rifles. Magpul UBR uses a proprietary intermediate length RE. KAC SR25/M110 also use that length. I have not used the RE10, but have used intermediate length RE's . Only the UBR Gen 2. Worth noting that the gen 1 has a carbine length RE. So if you want a UBR and you’re going for an A5 / RE10 / LMT .308/ Intermediate length RE, you’ll need the Gen 2 |
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Posted: 11/21/2021 1:18:24 PM EST
[#21]
Also fun fact for anyone who is looking to run an Intermediate length RE:
Everyone knows that the Armalite AE1095 spring is known to work well with a standard H2 or H3 buffer. In the world of supply chain woes, you may be wondering if you can use a different spring. I asked around last year and found no info on the LMT .308 action spring vs the AE1095 as far as compatibility. So I tried both on my LMT MWS for the sake of science. Both cycled fine- LMT action spring was a bit more lively in the action, but the AE1095 didn’t give me any issues on the bench while shooting FGMM 168 or M80 ball. Top: AE1095 (Armalite .308 action spring) Bottom: LM308A9 (LMT .308 action spring)  Attached FileI know this isn’t M5 specific, but when I built an M5 I asked and no one knew if these springs were interchangeable so hopefully this info is useful for someone. |
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Posted: 11/21/2021 1:41:58 PM EST
[#22]
Quote HistoryQuoted: Also fun fact for anyone who is looking to run an Intermediate length RE: Everyone knows that the Armalite AE1095 spring is known to work well with a standard H2 or H3 buffer. In the world of supply chain woes, you may be wondering if you can use a different spring. I asked around last year and found no info on the LMT .308 action spring vs the AE1095 as far as compatibility. So I tried both on my LMT MWS for the sake of science. Both cycled fine- LMT action spring was a bit more lively in the action, but the AE1095 didn’t give me any issues on the bench while shooting FGMM 168 or M80 ball. Top: AE1095 (Armalite .308 action spring) Bottom: LM308A9 (LMT .308 action spring) https://www.ar15.com/media/mediaFiles/457582/4FCC2249-D3BB-4B8E-B7DD-51612F36AA1C_jpe-2175736.JPG I know this isn’t M5 specific, but when I built an M5 I asked and no one knew if these springs were interchangeable so hopefully this info is useful for someone. If I were to buy an MWS buffer tube kit would that be all I need to go intermediate with an M5? |
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Posted: 11/21/2021 3:09:03 PM EST
[#23]
Completing the components for a M5. I ordered a Krieger by CLE in 20 in. Should I have gotten the 22in?
I plan on using the JP CS and a Superlative gas block. |
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Posted: 11/21/2021 3:14:18 PM EST
[#24]
Quote HistoryQuoted: If I were to buy an MWS buffer tube kit would that be all I need to go intermediate with an M5? As shown, the LMT spring is a bit more stout than the Armalite, but if you use an H3 (or heavier depending on gas system) you should be good to go based on what I saw with my M5 & MWS |
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Posted: 11/21/2021 4:22:53 PM EST
[#25]
Which spring and buffer combo did you end up sticking with?
Which spring was softer shooting? Quote HistoryQuoted: Also fun fact for anyone who is looking to run an Intermediate length RE: Everyone knows that the Armalite AE1095 spring is known to work well with a standard H2 or H3 buffer. In the world of supply chain woes, you may be wondering if you can use a different spring. I asked around last year and found no info on the LMT .308 action spring vs the AE1095 as far as compatibility. So I tried both on my LMT MWS for the sake of science. Both cycled fine- LMT action spring was a bit more lively in the action, but the AE1095 didn’t give me any issues on the bench while shooting FGMM 168 or M80 ball. Top: AE1095 (Armalite .308 action spring) Bottom: LM308A9 (LMT .308 action spring) https://www.ar15.com/media/mediaFiles/457582/4FCC2249-D3BB-4B8E-B7DD-51612F36AA1C_jpe-2175736.JPG I know this isn’t M5 specific, but when I built an M5 I asked and no one knew if these springs were interchangeable so hopefully this info is useful for someone. |
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Posted: 11/21/2021 4:43:50 PM EST
[#26]
I ended up keeping the stock MWS configuration (LMT spring and H3).
I can’t really say which was “softer” but the LMT spring seemed to have less “slap” when shooting suppressed. Not too surprising since the whole system was being used as designed. |
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Posted: 11/21/2021 6:38:06 PM EST
[#27]
i picked up another m5 lower, bcg and upper. waiting for the breach to come in.
thinking a slr 7.5 barell setup be nice with my 10.5 |
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Posted: 11/21/2021 8:58:57 PM EST
[#28]
Quote HistoryQuoted: Only the UBR Gen 2. Worth noting that the gen 1 has a carbine length RE. So if you want a UBR and you’re going for an A5 / RE10 / LMT .308/ Intermediate length RE, you’ll need the Gen 2 Quote HistoryQuoted: Quoted: The RE10 is functionally the same as a intermediate, or A5, length RE. The difference is the number of stock position holes and less threaded length. Armalite uses the intermediate length RE for their AR-10 adjustable stock rifles. Magpul UBR uses a proprietary intermediate length RE. KAC SR25/M110 also use that length. I have not used the RE10, but have used intermediate length RE's . Only the UBR Gen 2. Worth noting that the gen 1 has a carbine length RE. So if you want a UBR and you’re going for an A5 / RE10 / LMT .308/ Intermediate length RE, you’ll need the Gen 2 Good point. Other than the used market, there's still some NOS out there. |
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Posted: 11/21/2021 10:17:28 PM EST
[#29]
Pulled the trigger on an 18” 6.5 creedmoor BA barrel. I’ve got the blem set of enhanced M5 receivers and enhanced handguard. Need a bcg and I’ll be going with the superlative arms block. Griffin plan A for the Nomad L. Need to decide on a scope. Will be my first longer range rifle. 556 AR has a 1x4, 300 blackout pistol has a Holosun 510. Really kind of want a 1x10 for this but my eyes are horrible and I could use a little more magnification if shooting 500 yards.
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Posted: 11/21/2021 10:44:13 PM EST
[#30]
Quote HistoryQuoted: i picked up another m5 lower, bcg and upper. waiting for the breach to come in. thinking a slr 7.5 barell setup be nice with my 10.5 I have the SLR 7.5” barrel. It’s all kinds of fun to shoot. Gotta be suppressed though, that thing is concussive. |
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Posted: 11/22/2021 4:51:28 PM EST
[#31]
Went ahead and ordered the R-one and set screw Superlative Arms gas block. Had myself convinced I was going to lose accuracy with a set screw block. When in reality there's no way I'm good enough to notice :). SLR dimpling jig is also on the way.
Anyone seen a 6.5 Surefire SOCOM Brake in stock? |
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Posted: 11/23/2021 9:19:46 PM EST
[#32]
For those that are using longer barrels, what made you choose the length that you did?
I’m was initially thinking 20” but 18” may be better since I plan to suppress it. |
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Posted: 11/24/2021 12:02:38 AM EST
[#33]
Quoted: For those that are using longer barrels, what made you choose the length that you did? i have access to a range that goes out to 1,300 yds. for this range, I have several uppers with barrel lengths from 20" to 24". 308 & 6.5CM. to eke out that last smidgen of performance from the cartridge. |
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Posted: 11/24/2021 8:11:52 AM EST
[#34]
Quote HistoryQuoted: For those that are using longer barrels, what made you choose the length that you did? I’m was initially thinking 20” but 18” may be better since I plan to suppress it. Go 16" if you're worried about length |
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Posted: 11/24/2021 12:16:31 PM EST
[#35]
Quote HistoryQuoted: Go 16" if you're worried about length Quote HistoryQuoted: Quoted: For those that are using longer barrels, what made you choose the length that you did? I’m was initially thinking 20” but 18” may be better since I plan to suppress it. Go 16" if you're worried about length 16” seems a bit too short IMO, I’m more worried about weight than OAL. |
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Posted: 11/24/2021 12:58:50 PM EST
[#36]
Quote HistoryQuoted: 16” seems a bit too short IMO, I’m more worried about weight than OAL. 16” RLGS is tits 
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Posted: 11/24/2021 2:09:15 PM EST
[#37]
Quote HistoryQuoted: I have the standard Aero rail and my Superlative Arms clamp on adjustable gas block fit fine. https://i.imgur.com/HpVnXGK.jpeg Sir- Is that the “high” optics mount? Thank you. |
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Posted: 11/24/2021 2:28:42 PM EST
[#38]
Quote HistoryQuoted: 16” seems a bit too short IMO, I’m more worried about weight than OAL. Quote HistoryQuoted: Quoted: Quoted: For those that are using longer barrels, what made you choose the length that you did? I’m was initially thinking 20” but 18” may be better since I plan to suppress it. Go 16" if you're worried about length 16” seems a bit too short IMO, I’m more worried about weight than OAL. I guess that depends on what you're doing. Plenty of 16" guns running around in combat doing just fine |
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Posted: 11/24/2021 3:04:27 PM EST
[#39]
Quote HistoryQuoted: I guess that depends on what you're doing. Plenty of 16" guns running around in combat doing just fine This above, A 16in barrel will be enough for 95% of people and their skill level. Too many shooters think adding 2-4in to a barrels length will fix their shooting skills. |
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Posted: 11/25/2021 7:20:09 AM EST
[#40]
Hello,
Considering a large frame. Is there a "standard" recipe for these like I might use for a small frame (Aero lower/BCM upper/Criterion or Triarc barrel combo gives me a great small frame rifle)? Anything to completely avoid? Basically, there is a "BCM" level large frame AR? I like the aesthetics of the AP M5, but what am I loosing over over large frame platforms. I'm not expecting it to be a KAC/LMT, but I want it to be reasonably accurate (.75-1.25 MOA) and reliable. This is the same standard I hold my small frame to. What kind of accuracy and overall durability are y'all seeing from the various Faxon barrels compared to a BA or Criterion? |
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Posted: 11/25/2021 5:59:23 PM EST
[#41]
Just finished butchering my first .308. 18".
     
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Posted: 11/25/2021 6:40:41 PM EST
[#42]
Quote HistoryQuoted: Hello, Considering a large frame. Is there a "standard" recipe for these like I might use for a small frame (Aero lower/BCM upper/Criterion or Triarc barrel combo gives me a great small frame rifle)? Anything to completely avoid? Basically, there is a "BCM" level large frame AR? I like the aesthetics of the AP M5, but what am I loosing over over large frame platforms. I'm not expecting it to be a KAC/LMT, but I want it to be reasonably accurate (.75-1.25 MOA) and reliable. This is the same standard I hold my small frame to. What kind of accuracy and overall durability are y'all seeing from the various Faxon barrels compared to a BA or Criterion? My opinion, don't mix receiver manufacturers. Some combinations will work, but you're starting off with a handicap. |
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Posted: 11/29/2021 4:43:57 AM EST
[#43]
Quote HistoryQuoted: That’s basically what I wanted to do with mine, but that rail is so expensive. If you don’t mind surplus a guy is the EE is selling the mk11 rails for not horrid price. The two I got came painted but a night soaking in stripper fixed that. One is better condition than the other but both are completely functional. Did not come with anti-rotation pins but I’m looking into have some made as I can’t find any instock. |
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Posted: 11/29/2021 5:20:19 AM EST
[#44]
Quote HistoryQuoted: If you don’t mind surplus a guy is the EE is selling the mk11 rails for not horrid price. The two I got came painted but a night soaking in stripper fixed that. One is better condition than the other but both are completely functional. Did not come with anti-rotation pins but I’m looking into have some made as I can’t find any instock. Quote HistoryQuoted: Quoted: That’s basically what I wanted to do with mine, but that rail is so expensive. If you don’t mind surplus a guy is the EE is selling the mk11 rails for not horrid price. The two I got came painted but a night soaking in stripper fixed that. One is better condition than the other but both are completely functional. Did not come with anti-rotation pins but I’m looking into have some made as I can’t find any instock. Do you happen to have the link? I’m not having any luck finding it. |
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Posted: 11/29/2021 5:45:11 AM EST
[#45]
Quote HistoryQuoted: Do you happen to have the link? I’m not having any luck finding it. https://www.ar15.com/forums/Equipment-Exchange/Knights-Armament-MK11-MOD-0-RAILS-Surplus-Used-350-shipped/120-2186465/ |
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Posted: 12/3/2021 10:57:44 AM EST
[#46]
Quote HistoryQuote HistoryQuoted: Quoted: Do you happen to have the link? I’m not having any luck finding it. https://www.ar15.com/forums/Equipment-Exchange/Knights-Armament-MK11-MOD-0-RAILS-Surplus-Used-350-shipped/120-2186465/ Thank you. Gave it some thought and ended up going with a URX 4. |
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Posted: 12/9/2021 8:55:53 AM EST
[#47]
Can someone please tell me what buffer they are running in their M5 with a PRS stock?
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Posted: 12/9/2021 12:25:10 PM EST
[#48]
Quote HistoryQuoted: Can someone please tell me what buffer they are running in their M5 with a PRS stock? I have an Aero .308 rifle buffer. I've been having issues with that build (18" 6.5) and haven't isolated it yet so I don't know if the buffer is the issue, gas block settings, etc. 
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Posted: 12/10/2021 1:12:37 PM EST
[#49]
Getting there on my poor mans SR25.
I still have to figure out a barrel, I’m trying to avoid anything heavy but would still like to be able to stretch its legs when I feel like it. I’ll also need to figure out an optic, thinking LPVO at this point. Even without a barrel I think it’s already as heavy as my lighter AR15s. 
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Posted: 12/10/2021 1:53:29 PM EST
[#50]
Quote HistoryQuoted: Getting there on my poor mans SR25. I still have to figure out a barrel, I’m trying to avoid anything heavy but would still like to be able to stretch its legs when I feel like it. I’ll also need to figure out an optic, thinking LPVO at this point. Even without a barrel I think it’s already as heavy as my lighter AR15s. https://i.imgur.com/ipQlNrz.jpg I have a Faxon 20" Match on my 6.5CM AR. Great compromise between light profile and stiffness. No problems getting out to ~1300m. I've cleaned it once in the 450 rounds I have through it. Still shoots .55". |
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