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Posted: 5/5/2013 12:10:10 AM EDT
[Last Edit: Stickman]
The Centurion Modular Rail (CMR) was first shown at SHOT 2013, and was shown installed on a Centurion Arms complete .308 build. The rail received positive reviews from everyone who handled it, but the most common question was how long it would be until a 5.56 variant was released.
For the past several months, I've been working with the Centurion Arms .308 Battle Rifle, and the CMR rail has quickly become one of my favorite. The over all feel and light weight provides a great balance for the .308 platform. Fast forwarding to more recent times, and I'm now in a position to comment on the 5.56 CMR rails. I have had a chance to run drills, do several installations, as well as have a friend and fellow instructor go over them with me. Without a doubt, these are some of the easiest, if not "THE" easiest barrel nut and rail assembly either of us have ever installed. The Centurion Modular Rail is first being released in 12 and 14 inch versions in both the 5.56 and .308 variants. The 12" rail weighs 10 7/8 oz (308g), and with the barrel nut and three installation screws is a total of 13 1/8oz (371g). Total length is roughly 12 1/2", which is normal for most rails labeled as 12 inchers. The reason for this is that is the length needed to cover the receiver to FSB on a rifle, which is the traditional 12"/ rifle rail. If the CMR used an old school locking collar, the actual rail would be 12" while the collar made up the difference. The 14" rail weighs 11 3/4 oz (333g), and with the barrel nut and three installation screws is a total of 14 oz (398g). Machine work on the rails is all extremely high quality, and the anodizing is very clean. It is evident these rails have a lot of machine time, and for people who are unaware, machine time is what is the driving force behind the end price. This is why you see cheap, heavy rails with sharp edges being sold for low prices. This is not a cheap heavy rail, and it does not have sharp edges. The sides are blended nicely, and the lightening / cooling/ vent holes are well laid out. Anti-rotation tabs are part of the rail, and are nice and snug on each of the forged receivers we used (3 total). There are QD holes fore and aft on each side. Installation of the rail is easy, and it is entirely possible we will do another article showing the various steps. For now, we will just talk about it a bit. The barrel nut is grooved, and the bolts which lock the barrel nut to the rail ensure there can be no movement once installed. The barrel nut is tightened with an old school barrel nut wrench, the type that only has one tooth. These are pretty cheap to pick up if you don't already have one, and don't slip off like a standard barrel nut. The other way to do it is using a spanner wrench (the pin or hook type), which should run you under $15 for most hardware or similar stores. Torque specs are 30-80 ft pounds, which is simple when there is no need to line up a gas tube. With the barrel nut installed, slide the end of the rail into place. It may take a firm press to lock it up against the receiver, and it is normal to have a tiny space in between the two parts. Now use a 3/32 allen head wrench and install the 3 screws. There is no need for thread locker, but you should alternate tightening each screw and side just like you would a lug nut. Watch your alignment on the top of the rail and your receiver, but we found everything lined up perfect ever after we took it apart a few times. The Centurion Modular Rails will be hitting your AR15 stores this month in 12 & 14" and in 5.56 and .308. You may notice the second picture has a Surefire Scout Light mounted, this is a prototype of one of the mounts Centurion Arms will be releasing along with the rails. 1913 sections are also going to be coming out shortly, and none of these add one pieces use backer plates or screws. There are also some additional items coming out for this rail series, but I'm not 100% sure what I can or can't talk about. When I get more information, and verify that I can speak freely, I'll post more info and pictures. If you have any questions, feel free to fire away, I'll answer whatever I can. |
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Stick
[email protected] www.rainierarms.com (253) 218-2999 Office (253) 218-2998 FAX www.weaponevolution.com www.stickgunner.com |
"Have a smile for breakfast, you'll be shitting joy by lunch.” - Joe Abercrombie
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Originally Posted By USMC_JA:
Its a C4...but feels appropriate for this thread nonetheless. https://i.imgur.com/9a17YUv.jpg https://i.imgur.com/74Q7I8o.jpg https://i.imgur.com/uV2Gq3W.jpg https://i.imgur.com/8f29CL9.jpg View Quote |
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Originally Posted By brx123: Very nice , how do like the new mlok version. View Quote |
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"Have a smile for breakfast, you'll be shitting joy by lunch.” - Joe Abercrombie
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Sounds great Thanks
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Here's my wife's full 10.3" Centurion build with the billet lower - Super nice lightweight little gun
Attached File Attached File |
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I picked up a 12.5 Centurion Arms upper for my work gun.
Had it out training today for about 450-500 rounds since the weather was nice. Soft shooting with the SF brake on it. Very pleased.... Monty builds them right. Attached File |
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Shoot, Move, and Communicate
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Originally Posted By SoTexAggie:
CMR 11 on a 12.5” bbl. Thinking of doing an 8-9” .300 blk upper and want to go with a CMR on it. Might have to find a 9.5 and chop it down.. https://www.AR15.Com/media/mediaFiles/207228/E56339F6-FC41-4C48-8A9F-95082844FF80_jpe-1254369.JPG View Quote Attached File Attached File |
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Originally Posted By Frens:
https://i.postimg.cc/BnsSRbw7/0138-E28-A-FC5-E-4212-8-F3-E-7643570152-E7.jpg View Quote |
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The tan on black looks very good
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Anyone know if a CMR MLOK 13” with a BA 14” Hanson barrel will give enough clearance to mount a DA Sandman on a DA FH?
Actual length on the CMR 13” MLOK is 13.468” Pics would be great if anyone runs this barrel/rail combo. |
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Originally Posted By ARBrad: Anyone know if a CMR MLOK 13” with a BA 14” Hanson barrel will give enough clearance to mount a DA Sandman on a DA FH? Actual length on the CMR 13” MLOK is 13.468” Pics would be great if anyone runs this barrel/rail combo. View Quote I thought the MLOK versions were exactly 13", you may want to confirm with Centurion. If so, the answer is almost guaranteed yes |
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Have any of you guys used the centurion 14.5" recce barrel if so , how good is it?
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"Have a smile for breakfast, you'll be shitting joy by lunch.” - Joe Abercrombie
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Damn that came out nice , love that dimpling on the barrel. Where did you score the gray buffer tube
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"Have a smile for breakfast, you'll be shitting joy by lunch.” - Joe Abercrombie
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remove
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Im not saying duracoat fucks up function, I am saying nutnfancy does. -RustedAce
I might have big ears... but you are a fucking idiot. -WestDesRat |
All of you guys builds look badass
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I'll post up an updated picture of mine in it's final form
Attached File 12.3in Hanson barrel with undersized gas port, suppressor only aka my poor man's Hodge Vltor A5 RE with A5H2 buffer Arisaka 600 light with Arisaka offset mount and Cloud Defensive LCS Finally decided on the B5 SOPMOD Enhanced and Reptilia CQG grip |
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YMMV
AR3 |
How's the lock up and rigidity on the 5.56 M-LOK rail? I have a 13" CMT rail that has similar dimensions and when I hit the side of the rail it hits the gas block. No bueno, and I'm looking for another rail.
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Originally Posted By USNIGHTGUNNER: How's the lock up and rigidity on the 5.56 M-LOK rail? I have a 13" CMT rail that has similar dimensions and when I hit the side of the rail it hits the gas block. No bueno, and I'm looking for another rail. View Quote All 3 of mine are extremely rigid no play what so ever. I had to use a heat gun just to get them overvthe barrel nut. |
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Originally Posted By USNIGHTGUNNER: How's the lock up and rigidity on the 5.56 M-LOK rail? I have a 13" CMT rail that has similar dimensions and when I hit the side of the rail it hits the gas block. No bueno, and I'm looking for another rail. View Quote I had the EXACT same problem with my 13" CMT rail. I couldn't get it off fast enough. |
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Looks like I’m jumping in a few years late. I just ordered the 7.62 cmr for a .308 build. I hope the barrel isn’t over gassed since it looks like an adjustable gas block will be hard to squeeze under the rail. Anyway, does anyone think loading a bipod with moderate pressure would cause a 14” cmr to flex and hit Centurion’s low pro block (.875) or is there enough room? Loving everyone’s setups!
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Originally Posted By 99arproblems: Looks like I’m jumping in a few years late. I just ordered the 7.62 cmr for a .308 build. I hope the barrel isn’t over gassed since it looks like an adjustable gas block will be hard to squeeze under the rail. Anyway, does anyone think loading a bipod with moderate pressure would cause a 14” cmr to flex and hit Centurion’s low pro block (.875) or is there enough room? Loving everyone’s setups! View Quote No i don't think you'll have any problems the centurion gb is very small , but i would still check just to be certain. I would definitely check your adj gb under a cmr though they have a very slim profile , i know on the 5.56 cmr the centurion gb is the only one they guarentee to fit. |
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YMMV
AR3 |
I am hoping the rail is solid. I just ordered an Mlok 10.5. It will be my first Centurion rail. It will be replacing a BCM KMR as I want to get away from keymod.
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Originally Posted By l_Ferret_l: I am hoping the rail is solid. I just ordered an Mlok 10.5. It will be my first Centurion rail. It will be replacing a BCM KMR as I want to get away from keymod. View Quote Don't sweat the quality of Centurion gear. Its a solid rail. Perhaps even BEYOND solid....time will tell. |
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"Have a smile for breakfast, you'll be shitting joy by lunch.” - Joe Abercrombie
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I got the rail and it is installed. It feels super solid. Very happy with it so far.
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View Quote Can we see some full rifle pics?? |
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I'll try to grab a few shots tonight when I get back to the house.
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Building a 762 and can’t decide between a Centurion rail or SLR? Which one should I choose?
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Originally Posted By great308: Building a 762 and can’t decide between a Centurion rail or SLR? Which one should I choose? View Quote Both are quality , I've had such a great experience with not only there product but with the company and people who run it . I'll always go back and reccomend centurion. |
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Need some help...
Getting another Centurion Arms with 13” mlok rail They are out of barrels with no eta. Does anyone know if I grab a 14.5 LaRue Stealth barrel and gas block will it fit under a Centurion Arms rail ok...?? |
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Shoot, Move, and Communicate
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Originally Posted By MONGO45: Need some help... Getting another Centurion Arms with 13” mlok rail They are out of barrels with no eta. Does anyone know if I grab a 14.5 LaRue Stealth barrel and gas block will it fit under a Centurion Arms rail ok...?? View Quote I have a predatar I can measure later when I get home. The cmr has a 1.23" ID only GB I've found that worked was theres. |
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Originally Posted By MONGO45: Need some help... Getting another Centurion Arms with 13” mlok rail They are out of barrels with no eta. Does anyone know if I grab a 14.5 LaRue Stealth barrel and gas block will it fit under a Centurion Arms rail ok...?? View Quote The Larue GB will not fit. It's quite beefy, especially toward the bottom. The Centurion GB is designed for use with these rails, but I also run an SLR Rifleworks GB7 Micro under one of my CMRs with plenty of clearance. There are options out there, but measuring is key. |
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great info guys...!
Ill grab a CA gas block.. It would fit on a LaRue barrel ok correct...? |
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Shoot, Move, and Communicate
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