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Link Posted: 6/3/2019 2:44:41 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By riptastic5:
Heres a mock up of my build. its coming along slowly but surely. Waiting on a rosco 14.5 purebred barrel to come in.
Still need optic (rmr), light (surefire m300), backup sights (troy irons) and other small upgrades.
I've been buying all my components spread out over time so I havent realized how much I've put in this rifle. Dont think
Im going to do the math or I might freak out...lol

http://i.imgur.com/z38q5Fv.jpg?1
View Quote
I would definitely recommend a different optic than the RMR for a rifle. It's gonna be a b*tch to find that red dot in that tiny window
Link Posted: 6/17/2019 10:06:03 PM EST
[Last Edit: 6/17/2019 10:15:04 PM EST by riptastic5]
Finnaly ready to hit the range this weekend. Still need irons and a proper optic.
This is my favorite build to date.


Link Posted: 6/22/2019 8:33:19 AM EST
[Last Edit: 6/23/2019 10:55:11 AM EST by mhbaker81]
I posted this over in my Official Free Float FSB Builds Revival Picture Thread, but when I stumbled across this gem of a CMR thread, I knew I had to post here, too. I really hope we can keep this one going. Avoid the archive, folks!

Here's a little sneak preview of what's on deck in my little shop of horrors...

I decided to shed a few ounces off my Mini-Recce masterpiece, but felt I needed to stick with my old mistress, Centurion Arms. Before shots, for posterity...





Now, here's what I'm thinking next. Rail is a 14.25" Gen 2 CMR with Midlength cutout. The A.R.M.S. 41-B doesn't quite fit yet. Oh, but it most certainly will... IT WILL! (Planning on some fine-tuned dremel work for the base of the gas block, and even possibly adding some small relief cuts on bottom of rail if there is still contact.)

This is going to be epic.



Link Posted: 6/22/2019 8:47:14 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By mhbaker81:
I posted this over in my Official Free Float FSB Builds Revival Picture Thread, but when I stumbled across this gem of a CMR thread, I knew I had to post here, too. I really hope we can keep this one going. Avoid the archive, folks!

Here's a little sneak preview of what's on deck in my little shop of horrors...

I decided to shed a few ounces off my Mini-Recce masterpiece, but felt I needed the stick with my old mistress, Centurion Arms. Before shots, for posterity...

https://i.imgur.com/MWYEKyA.jpg

https://i.imgur.com/RCjqCmw.jpg

Now, here's what I'm thinking next. Rail is a 14.25" Gen 2 CMR with Midlength cutout. The A.R.M.S. 41-B doesn't quite fit yet. Oh, but it most certainly will... IT WILL! (Planning on some fine-tuned dremel work for the base of the gas block, and even possibly adding some small relief cuts on bottom of rail if there is still contact.)

Will the ARMS 41B sight fit inside the handguard?  It looks like it might a bit too large where the mounting bolts are.
This is going to be epic.

https://i.imgur.com/90bL9hF.jpg

https://i.imgur.com/S5TYkqH.jpg
View Quote
Link Posted: 6/22/2019 6:48:41 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By mhbaker81:
I posted this over in my Official Free Float FSB Builds Revival Picture Thread, but when I stumbled across this gem of a CMR thread, I knew I had to post here, too. I really hope we can keep this one going. Avoid the archive, folks!

Here's a little sneak preview of what's on deck in my little shop of horrors...

I decided to shed a few ounces off my Mini-Recce masterpiece, but felt I needed the stick with my old mistress, Centurion Arms. Before shots, for posterity...

https://i.imgur.com/MWYEKyA.jpg

https://i.imgur.com/RCjqCmw.jpg

Now, here's what I'm thinking next. Rail is a 14.25" Gen 2 CMR with Midlength cutout. The A.R.M.S. 41-B doesn't quite fit yet. Oh, but it most certainly will... IT WILL! (Planning on some fine-tuned dremel work for the base of the gas block, and even possibly adding some small relief cuts on bottom of rail if there is still contact.)

This is going to be epic.

https://i.imgur.com/90bL9hF.jpg

https://i.imgur.com/S5TYkqH.jpg
View Quote
I cannot wait to see this!
Link Posted: 6/23/2019 10:59:58 AM EST
[Last Edit: 6/23/2019 11:13:06 PM EST by mhbaker81]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Yojimbo:
Will the ARMS 41B sight fit inside the handguard? It looks like it might a bit too large where the mounting bolts are.
View Quote
As it is right now, definitely too big. The edges on the gas block are also too wide to slip into the fsb cutout. I'll be using my dremel-fu skills on both the block and the rail and will make it work so nothing touches.
Link Posted: 6/25/2019 7:09:20 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By mhbaker81:
[b]when I stumbled across this gem of a CMR thread, I knew I had to post here, too. I really hope we can keep this one going. Avoid the archive, folks
View Quote
What parameters cause a thread to archive?
Link Posted: 6/25/2019 9:41:44 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Veprz:

What parameters cause a thread to archive?
View Quote
Lack of activity. Not sure on duration.
Link Posted: 6/29/2019 5:43:38 PM EST
[Last Edit: 6/29/2019 5:44:56 PM EST by GoRebels]
10" 300 Blk w 9.5" CMR Gen 2




Needing a nice light weight 1x6 LPV and Light

14.5" w 14" CMR Gen 1

Link Posted: 7/6/2019 6:00:10 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Veprz:
I cannot wait to see this!
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Veprz:
Originally Posted By mhbaker81:
I posted this over in my Official Free Float FSB Builds Revival Picture Thread, but when I stumbled across this gem of a CMR thread, I knew I had to post here, too. I really hope we can keep this one going. Avoid the archive, folks!

Here's a little sneak preview of what's on deck in my little shop of horrors...

I decided to shed a few ounces off my Mini-Recce masterpiece, but felt I needed the stick with my old mistress, Centurion Arms. Before shots, for posterity...

https://i.imgur.com/MWYEKyA.jpg

https://i.imgur.com/RCjqCmw.jpg

Now, here's what I'm thinking next. Rail is a 14.25" Gen 2 CMR with Midlength cutout. The A.R.M.S. 41-B doesn't quite fit yet. Oh, but it most certainly will... IT WILL! (Planning on some fine-tuned dremel work for the base of the gas block, and even possibly adding some small relief cuts on bottom of rail if there is still contact.)

This is going to be epic.

https://i.imgur.com/90bL9hF.jpg

https://i.imgur.com/S5TYkqH.jpg
I cannot wait to see this!
Mod is coming along nicely. Just mocked everything up and it lines up perfectly. Will be done by Monday at the latest. Here's a sneak peek...



Link Posted: 7/8/2019 8:13:41 PM EST
[Last Edit: 7/8/2019 8:14:21 PM EST by mhbaker81]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By mhbaker81:
Mod is coming along nicely. Just mocked everything up and it lines up perfectly. Will be done by Monday at the latest. Here's a sneak peek...

https://i.imgur.com/ZQMzLqL.jpg

https://i.imgur.com/3po9HwM.jpg
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By mhbaker81:
Originally Posted By Veprz:
Originally Posted By mhbaker81:
I posted this over in my Official Free Float FSB Builds Revival Picture Thread, but when I stumbled across this gem of a CMR thread, I knew I had to post here, too. I really hope we can keep this one going. Avoid the archive, folks!

Here's a little sneak preview of what's on deck in my little shop of horrors...

I decided to shed a few ounces off my Mini-Recce masterpiece, but felt I needed the stick with my old mistress, Centurion Arms. Before shots, for posterity...

https://i.imgur.com/MWYEKyA.jpg

https://i.imgur.com/RCjqCmw.jpg

Now, here's what I'm thinking next. Rail is a 14.25" Gen 2 CMR with Midlength cutout. The A.R.M.S. 41-B doesn't quite fit yet. Oh, but it most certainly will... IT WILL! (Planning on some fine-tuned dremel work for the base of the gas block, and even possibly adding some small relief cuts on bottom of rail if there is still contact.)

This is going to be epic.

https://i.imgur.com/90bL9hF.jpg

https://i.imgur.com/S5TYkqH.jpg
I cannot wait to see this!
Mod is coming along nicely. Just mocked everything up and it lines up perfectly. Will be done by Monday at the latest. Here's a sneak peek...

https://i.imgur.com/ZQMzLqL.jpg

https://i.imgur.com/3po9HwM.jpg
I still have some cleaning and refinishing to do, but I am very happy to report that my "Dremel-Fu is-a-still strong" (-_-). The KAC M-lok rail sections are the perfect fit and help add a secure base for an IR laser and/or bipod. (I just had to mill them flat on the back.) As for the 41-B, even after trimming the base down, it still would have made contact with the inside of the rail. My relief cuts give it just enough breathing room, but the clamps still don't extend past the belly of the beast. This allows for some rail covers with room to spare. All in all, I'm loving the look with the 41-B at the midlength position. Here's a few mock-ups of the finished product.













Link Posted: 7/8/2019 10:14:28 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By mhbaker81:

I still have some cleaning and refinishing to do, but I am very happy to report that my "Dremel-Fu is-a-still strong" (-_-). The KAC M-lok rail sections are the perfect fit and help add a secure base for an IR laser and/or bipod. (I just had to mill them flat on the back.) As for the 41-B, even after trimming the base down, it still would have made contact with the inside of the rail. My relief cuts give it just enough breathing room, but the clamps still don't extend past the belly of the beast. This allows for some rail covers with room to spare. All in all, I'm loving the look with the 41-B at the midlength position. Here's a few mock-ups of the finished product.

https://i.imgur.com/Fv6qOo0.jpg

https://i.imgur.com/OuzxzE0.jpg

https://i.imgur.com/wmjbqIh.jpg

https://i.imgur.com/Jl2HBtn.jpg

https://i.imgur.com/Qdi4Y9v.jpg

https://i.imgur.com/Ma1KqwA.jpg

https://i.imgur.com/KPvCQnI.jpg
View Quote
Awesome! Looks great, OD Green is where its at too.
Link Posted: 7/10/2019 12:43:34 PM EST
Afternoon gents...looking to build an M5 in 6.5 creedmoor later this year, and was interested in this rail.

Anyone able to fit a SLR adjustable Sentry 8 (.875) gas block in their 7.62 CMR rail?  Seems like too tight a fit:

SLR website says the Sentry 8 Needs 1.35" Minimum ID.
Centurion website states the 7.62 CMR has an Inside Diameter of 1.441"
Link Posted: 7/16/2019 4:37:50 PM EST
[Last Edit: 7/16/2019 4:38:29 PM EST by mhbaker81]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Unicron:
Afternoon gents...looking to build an M5 in 6.5 creedmoor later this year, and was interested in this rail.

Anyone able to fit a SLR adjustable Sentry 8 (.875) gas block in their 7.62 CMR rail?  Seems like too tight a fit:

SLR website says the Sentry 8 Needs 1.35" Minimum ID.
Centurion website states the 7.62 CMR has an Inside Diameter of 1.441"
View Quote
I'll be investigating the exact same setup here shortly (M5 receiver set, 6.5 creed barrel, and M-Lok CMR 308 rail). I think it should work. The clamp on version looks lower profile than the set screw version. If all else fails, we can just continue to perfect our "Dremel-Fu".
Link Posted: 7/21/2019 12:51:55 PM EST
[Last Edit: 7/21/2019 6:33:13 PM EST by mhbaker81]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Veprz:
Awesome! Looks great, OD Green is where its at too.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Veprz:
Originally Posted By mhbaker81:

I still have some cleaning and refinishing to do, but I am very happy to report that my "Dremel-Fu is-a-still strong" (-_-). The KAC M-lok rail sections are the perfect fit and help add a secure base for an IR laser and/or bipod. (I just had to mill them flat on the back.) As for the 41-B, even after trimming the base down, it still would have made contact with the inside of the rail. My relief cuts give it just enough breathing room, but the clamps still don't extend past the belly of the beast. This allows for some rail covers with room to spare. All in all, I'm loving the look with the 41-B at the midlength position. Here's a few mock-ups of the finished product.

https://i.imgur.com/Fv6qOo0.jpg

https://i.imgur.com/OuzxzE0.jpg

https://i.imgur.com/wmjbqIh.jpg

https://i.imgur.com/Jl2HBtn.jpg

https://i.imgur.com/Qdi4Y9v.jpg

https://i.imgur.com/Ma1KqwA.jpg

https://i.imgur.com/KPvCQnI.jpg
Awesome! Looks great, OD Green is where its at too.
She's done. I had alot of fun with this build. Definitely unlike anything else I've put together, or seen before. This is my futuristic recce build. Kind of a modernized take on the SPR.

Upper:
- Aero upper receiver assembly
- 16" Daniel Defense midlength gov profile barrel (1:7)
- Ballistic Advantage melonited midlength gas tube
- A.R.M.S 41-B Silouette front sight gas block
- Primary Weapons System PWS FSC556 muzzle device
- Modified Centurion Arms 14.25" CMR Rail with midlength FSB cutout
- Modified OD green CMR covers, handstop, and Magpul M-LOK MVG
- Arisaka CMR offset rail mount
- Inforce WMLx (IR version)
- Modified KAC M-LOK rail sections
- Harris/Larue BRM-S and LT706 QD Swivel Mount Combo with added KMW Pod-Loc
- Magpul MBUS Pro LR rear sight
- Larue SPR-E mount
- Steiner M5Xi scope
- Palmetto Premium BCG with Sprinco extra power extractor spring upgrade
- Radian Raptor charging handle

Lower:
- PA-15 Iraq lower and parts
- Larue MBT-2S trigger
- Radian Talon ambi safety
- OD green Magpul K2+ grip with battery storage
- IWC QD endplate
- Brownells 6 position buffer tube (milspec)
- Sprinco Blue Buffer spring
- Colt H buffer
- OD Magpul SL stock









Link Posted: 7/21/2019 3:31:48 PM EST
Colt 6920, Trijicon MRO, LaRue trigger and mount, Surefire X300U, Magpul

Attachment Attached File
Link Posted: 7/21/2019 5:15:53 PM EST
I <3 this thread.   I need to get another cmr.   When i just had an mro on a 16" bbl, it handled soooo well
Link Posted: 7/21/2019 5:16:44 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By cjwwd2:
I have not tried it but after installing CMRs and geissele gas blocks on different rifles, I would guess it would not fit.

I would recommend a SLR Sentry gas block. The set screw, adjustable and non-adjustable versions will work perfectly.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By cjwwd2:
Originally Posted By samcrow:
Does anyone know if the geissele super gas block will fit under the Mlok CMR? Thanks!
I have not tried it but after installing CMRs and geissele gas blocks on different rifles, I would guess it would not fit.

I would recommend a SLR Sentry gas block. The set screw, adjustable and non-adjustable versions will work perfectly.
How much clearance?
Link Posted: 7/21/2019 5:32:03 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By phlegm:
http://i63.tinypic.com/111icn5.jpg
View Quote
Link Posted: 7/21/2019 5:41:47 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By 1Wolf:
The centurion locks onto the bbl nut with a crossbolt, it's nothing like the very poorly designed clamp 'n glue MI rails. (I had 2 of those.  I still have the 12" ssg on a lightweight rifle that will never see anything resembling hard use)

Ive had the MI rail slide off the bbl nut while shooting lol.

Thanks kindly @InfamousAK for hopping in to help.  Its greatly appreciated :)

It will be based on either a SAN TAN billet Ambi upper/lower or an SLR billet Ambi upper/lower.  14.5" lightweight pinned with a VG6 Gamma & CAGE device.  Its kind of a Recce style I suppose (lightweight barrel though) and will wear a 1-6 or 1-8 LPVO.  Its going to have kind of a futuristic, Star Warsy, or blastery type look to it.  Its going to be nice & lightweight (Hopefully to offset some of the weight from the LPVO and mount) but not specifically going for "Ultra" lightweight with titanium or lightweight carriers and such.  I was originally considering a Battle Arms BAD556 Ambi receiver but decided against it due to that "V" shape to the mag well.  I'm also considering an adjustable gas block (As I've never tried an adjustable before) on a .625 gas journal barrel to keep the profile as small as possible.  Or I might still go non-adjustable.   Haven't decided yet.  I know I'd need to keep it small if I went with a Centurion.

It will be a general purpose rifle...range use, carbine classes, up close and shooting fast, and at distance of the bench (well...medium range....longest I can do at my local range is 600 yards).  Most accuracy shooting done 100 or 200 yards.

For the hand guard I'm pretty much narrowed to three manufacturers:  Centurion CMR, a Geissele, or an SLR.  I was dead set on a Geissele when I started but the more I look at the picture threads the more they seem just a bit "square" for this build.  The SLR is tempting because it would probably match up best with an SLR receiver and they have some interesting cosmetic shapes & touches for this build.  I haven't researched the lockup or practicality of the SLR though.  I'm sure the Geissele is GTG.

I was drawn to the Centurion for two reasons:  1)  Appearance and 2) Size.  Its got that small, round, profile with the holes that makes it look kind futuristic and blastery.  I like the MLOK CMR I've seen alright but, cosmetically at least, I seem to like the one with the screw-in accessories slightly better better.  I don't know much about either and the threads I've read about Gen1 & Gen2 and old & new are all very confusing when you're new to the Centurion CMR.  The MLOK seems more practical.  However, the large "flat" area on the sides for the MLOK doesn't look as nice to me as the more narrow flat sides on the ones with the screw-on attachments.  I could go either way.  I have no idea how practical the screw-on style is and I'm not sure how easy it is to attach a Surefire Mini-Scout and Arisaka mount.  I've seen pics of them here but not sure how hard it was to attach.  Or maybe the screw-on ones are just as practical.  I'm guessing that maybe the MLOK version is more practical and the screw-on version, subjectively, is more attractive.

On my other rifles I'm not one of those that swaps accessories much.  Usually a light, sometimes a tape switch and sometimes not, sometimes a Magpul sling mount up on the upper rail halfway down the rail, rail panels to protect my hands, and thats about it.  Once I have it the way I like it, I generally don't change it much.

I'm not glued to any one system.  I've got a keymod rifle, I've got an MLOK rifle.  I don't mind a third system.  Doesn't really matter.  Though I don't think I'd do another keymod.

As far as function goes:  I LOVE the size, feel, & weight of the Midwest Industries G3 SSM rail I have on another 14.5" pinned rifle.  The Centurion size, weight, & feel appear very similar.  However, as previously mentioned, I wasn't confident with the install and lock-up design and even though I got it installed true & centered and its fine now and I DID use their green loctite - I still have my doubts as to how "bomb-proof" it is.  It hasn't walked or moved on me yet though.  I dread if I need to pull that rail off for whatever reason and then having to reinstall it again.
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By 1Wolf:
Originally Posted By InfamousAK:

Well, tell us about your build, but I'm going to tell you already, the CMR is what you seek as it comes in all shapes and sizes, and whatever it is you are looking for, and one of the most solid lockups if that is your only concern. You looking for MLOK, Keymod, or Uniquely Centurion Arms, as those would be the differences between Gen 1 and Gen 2 I believe as I only own a Gen 2, and Gen 2 came with MLOK. Detail your build a little more and I can help you in the direction you seek, but as I said I'm bias as it comes to Centurion Arms though.
The centurion locks onto the bbl nut with a crossbolt, it's nothing like the very poorly designed clamp 'n glue MI rails. (I had 2 of those.  I still have the 12" ssg on a lightweight rifle that will never see anything resembling hard use)

Ive had the MI rail slide off the bbl nut while shooting lol.

Thanks kindly @InfamousAK for hopping in to help.  Its greatly appreciated :)

It will be based on either a SAN TAN billet Ambi upper/lower or an SLR billet Ambi upper/lower.  14.5" lightweight pinned with a VG6 Gamma & CAGE device.  Its kind of a Recce style I suppose (lightweight barrel though) and will wear a 1-6 or 1-8 LPVO.  Its going to have kind of a futuristic, Star Warsy, or blastery type look to it.  Its going to be nice & lightweight (Hopefully to offset some of the weight from the LPVO and mount) but not specifically going for "Ultra" lightweight with titanium or lightweight carriers and such.  I was originally considering a Battle Arms BAD556 Ambi receiver but decided against it due to that "V" shape to the mag well.  I'm also considering an adjustable gas block (As I've never tried an adjustable before) on a .625 gas journal barrel to keep the profile as small as possible.  Or I might still go non-adjustable.   Haven't decided yet.  I know I'd need to keep it small if I went with a Centurion.

It will be a general purpose rifle...range use, carbine classes, up close and shooting fast, and at distance of the bench (well...medium range....longest I can do at my local range is 600 yards).  Most accuracy shooting done 100 or 200 yards.

For the hand guard I'm pretty much narrowed to three manufacturers:  Centurion CMR, a Geissele, or an SLR.  I was dead set on a Geissele when I started but the more I look at the picture threads the more they seem just a bit "square" for this build.  The SLR is tempting because it would probably match up best with an SLR receiver and they have some interesting cosmetic shapes & touches for this build.  I haven't researched the lockup or practicality of the SLR though.  I'm sure the Geissele is GTG.

I was drawn to the Centurion for two reasons:  1)  Appearance and 2) Size.  Its got that small, round, profile with the holes that makes it look kind futuristic and blastery.  I like the MLOK CMR I've seen alright but, cosmetically at least, I seem to like the one with the screw-in accessories slightly better better.  I don't know much about either and the threads I've read about Gen1 & Gen2 and old & new are all very confusing when you're new to the Centurion CMR.  The MLOK seems more practical.  However, the large "flat" area on the sides for the MLOK doesn't look as nice to me as the more narrow flat sides on the ones with the screw-on attachments.  I could go either way.  I have no idea how practical the screw-on style is and I'm not sure how easy it is to attach a Surefire Mini-Scout and Arisaka mount.  I've seen pics of them here but not sure how hard it was to attach.  Or maybe the screw-on ones are just as practical.  I'm guessing that maybe the MLOK version is more practical and the screw-on version, subjectively, is more attractive.

On my other rifles I'm not one of those that swaps accessories much.  Usually a light, sometimes a tape switch and sometimes not, sometimes a Magpul sling mount up on the upper rail halfway down the rail, rail panels to protect my hands, and thats about it.  Once I have it the way I like it, I generally don't change it much.

I'm not glued to any one system.  I've got a keymod rifle, I've got an MLOK rifle.  I don't mind a third system.  Doesn't really matter.  Though I don't think I'd do another keymod.

As far as function goes:  I LOVE the size, feel, & weight of the Midwest Industries G3 SSM rail I have on another 14.5" pinned rifle.  The Centurion size, weight, & feel appear very similar.  However, as previously mentioned, I wasn't confident with the install and lock-up design and even though I got it installed true & centered and its fine now and I DID use their green loctite - I still have my doubts as to how "bomb-proof" it is.  It hasn't walked or moved on me yet though.  I dread if I need to pull that rail off for whatever reason and then having to reinstall it again.
Link Posted: 7/21/2019 6:09:07 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By mhbaker81:

She's done. I had alot of fun with this build. Definitely unlike anything else I've put together, or seen before. This is my futuristic recce build. Kind of a modernized take on the SPR.

Upper:
- Aero upper receiver assembly
- 16" Daniel Defense midlength gov profile barrel (1:7)
- Ballistic Advantage melonited midlength gas tube
- A.R.M.S 41-B Silouette front sight gas block
- Primary Weapons System PWS FSC556 muzzle device
- Centurion Arms 14.25" CMR Rail with midlength FSB cutout
- Modified OD green CMR covers, handstop, and Magpul M-LOK MVG
- Arisaka CMR offset rail mount
- Inforce WMLx (IR version)
- Modified KAC M-LOK rail sections
- Harris/Larue BRM-S and LT706 QD Swivel Mount Combo with added KMW Pod-Loc
- Magpul MBUS Pro LR rear sight
- Larue SPR-E mount
- Steiner M5Xi scope
- Palmetto Premium BCG with Sprinco extra power extractor spring upgrade
- Radian Raptor charging handle

Lower:
- PA-15 Iraq lower and parts
- Larue MBT-2S trigger
- Radian Talon ambi safety
- OD green Magpul K2+ grip with battery storage
- IWC QD endplate
- Brownells 6 position buffer tube (milspec)
- Sprinco Blue Buffer spring
- Colt H buffer
- OD Magpul SL stock

https://i.imgur.com/abaRd6O.jpg

https://i.imgur.com/rXEQBKi.jpg

https://i.imgur.com/hC2PGIT.jpg

https://i.imgur.com/NavkmDP.jpg

https://i.imgur.com/v6wv69p.jpg
View Quote
Freaking sick combination! Love it.

Does the A.R.M.S 41b come with sight post, spring, detent etc.?
Link Posted: 7/21/2019 6:32:07 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Veprz:

Freaking sick combination! Love it.

Does the A.R.M.S 41b come with sight post, spring, detent etc.?
View Quote
Yes it does. There is also a bayo lug version or a non-lug version. Both versions have a sling swivel attachment point to the rear. Needless to say mine has none of this after I shaved the base down as low as possible.
Link Posted: 8/3/2019 10:13:18 AM EST
[Last Edit: 8/3/2019 10:15:24 AM EST by 1Wolf]
I've got a 13" CMR Gen2 "Standard" Rail that I was planning to use on a build with a SLR Upper & Lower.  Unfortunately, the anti-rotation tabs on the top of the CMR rail look like they are going to be a problem.  They don't even come close to sliding onto the SLR Upper.

Just wondering if anyone else ran into the same thing with any upper and what they did?

I could grind off the tabs but then I fear the rail might be able to rotate.  Even if I did grind off the tabs, I can't say with 100% certainty whether the picatinny rail of the CMR would match up perfectly with the picatinny rail on the upper receiver.  I'd hope it would but I can't say for sure with those tabs in the way.  I just can't hold the receiver and the rail close enough together to tell if they match up.

So I either need to figure a reliable workaround that solves the tabs problem but won't let that rail rotate, or I need to select a new rail, or a new receiver.

ETA - You might see this post in the build forum as well as I figured maybe someone ran into something similar with a non-Centurion rail as well.  This is my 4th build and the first time I ran into a rail/receiver compatibility problem.
Link Posted: 8/3/2019 10:38:01 AM EST
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Originally Posted By 1Wolf:
I've got a 13" CMR Gen2 "Standard" Rail that I was planning to use on a build with a SLR Upper & Lower.  Unfortunately, the anti-rotation tabs on the top of the CMR rail look like they are going to be a problem.  They don't even come close to sliding onto the SLR Upper.

Just wondering if anyone else ran into the same thing with any upper and what they did?

I could grind off the tabs but then I fear the rail might be able to rotate.  Even if I did grind off the tabs, I can't say with 100% certainty whether the picatinny rail of the CMR would match up perfectly with the picatinny rail on the upper receiver.  I'd hope it would but I can't say for sure with those tabs in the way.  I just can't hold the receiver and the rail close enough together to tell if they match up.

So I either need to figure a reliable workaround that solves the tabs problem but won't let that rail rotate, or I need to select a new rail, or a new receiver.

ETA - You might see this post in the build forum as well as I figured maybe someone ran into something similar with a non-Centurion rail as well.  This is my 4th build and the first time I ran into a rail/receiver compatibility problem.
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Leave the rail... "Dremel-Fu" says to cut/grind grooves in the receiver for the tabs to slide into! (Says the guy who chopped the hell out of his CMR recently.) Or you could just go with a different receiver.

I think I remember reading through this whole thread an a few folks ground the tabs off with no issues. Personally, I wouldn't.
Link Posted: 8/10/2019 12:52:32 PM EST
I have an original 11" CMR and it's a great rail but I just don't like the fact that I have to use their GB.  Want to use an adjustable one.  Anyone know if you can use an adjustable GB with a CMR?
Link Posted: 8/11/2019 7:33:25 AM EST
Built this upper for a friend.

Link Posted: 8/12/2019 9:27:05 PM EST
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Nice build bro! Fantastic, simple, looks great, throw some BUIS on it that thing is pretty close to perfect!
Link Posted: 10/11/2019 8:06:24 PM EST
For everyone using Hanson profile barrels, are those the .625 or will the .750 fit?
Link Posted: 11/1/2019 9:40:11 PM EST
[Last Edit: 11/2/2019 10:41:40 PM EST by joe_sun]
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Originally Posted By joe_sun:
For everyone using Hanson profile barrels, are those the .625 or will the .750 fit?
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To answer my own question, the .750 hanson barrel works great in the Centurion arms M-lok rail. I went with the 12.3in and the 10.6 Mlok handguard. No matter how hard I press on the barrel it won't touch the handguard.

Waiting on BUIS
Attachment Attached File
Link Posted: 11/17/2019 4:18:50 PM EST
[Last Edit: 11/17/2019 4:23:38 PM EST by Ironcross]
Anyone have pics of a 11"" CMR on a 12.5" barrel?
Link Posted: 12/15/2019 1:23:42 AM EST
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Originally Posted By Ironcross:
Anyone have pics of a 11"" CMR on a 12.5" barrel?
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Sounds like one of my brothers behind enemy lines is thinking about jumping on the Non-NFA "Other Firearm" bandwagon. How about a 10.5" MLOK CMR with an 11.5" barrel. Combined with a Vltor A5 buffer tube, you'll achieve the >26" check in the box same as with a standard buffer tube and a 12.5" barrel. Just don't forget the obligatory VFG.



Link Posted: 12/15/2019 2:04:02 AM EST
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Originally Posted By Ironcross:
Anyone have pics of a 11"" CMR on a 12.5" barrel?
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Pic is right after i finished it no pics with optic but i put a pa 1x6 in a American Def qd mount

Link Posted: 12/15/2019 2:07:21 AM EST
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Originally Posted By 1Wolf:
I've got a 13" CMR Gen2 "Standard" Rail that I was planning to use on a build with a SLR Upper & Lower.  Unfortunately, the anti-rotation tabs on the top of the CMR rail look like they are going to be a problem.  They don't even come close to sliding onto the SLR Upper.

Just wondering if anyone else ran into the same thing with any upper and what they did?

I could grind off the tabs but then I fear the rail might be able to rotate.  Even if I did grind off the tabs, I can't say with 100% certainty whether the picatinny rail of the CMR would match up perfectly with the picatinny rail on the upper receiver.  I'd hope it would but I can't say for sure with those tabs in the way.  I just can't hold the receiver and the rail close enough together to tell if they match up.

So I either need to figure a reliable workaround that solves the tabs problem but won't let that rail rotate, or I need to select a new rail, or a new receiver.

ETA - You might see this post in the build forum as well as I figured maybe someone ran into something similar with a non-Centurion rail as well.  This is my 4th build and the first time I ran into a rail/receiver compatibility problem.
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I used a centurion upper and still had to tap it on with a soft mallet
Link Posted: 12/15/2019 9:13:58 AM EST
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Originally Posted By mhbaker81:

Sounds like one of my brothers behind enemy lines is thinking about jumping on the Non-NFA "Other Firearm" bandwagon. How about a 10.5" MLOK CMR with an 11.5" barrel. Combined with a Vltor A5 buffer tube, you'll achieve the >26" check in the box same as with a standard buffer tube and a 12.5" barrel. Just don't forget the obligatory VFG.

https://i.imgur.com/b8jzvlX.jpg

https://i.imgur.com/y7cdUo2.jpg
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Yep, thanks looks good!
Link Posted: 12/15/2019 9:15:32 AM EST
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Originally Posted By brx123:
Pic is right after i finished it no pics with optic but i put a pa 1x6 in a American Def qd mount

https://i.imgur.com/kmL0Gbh.jpg
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Originally Posted By brx123:
Originally Posted By Ironcross:
Anyone have pics of a 11"" CMR on a 12.5" barrel?
Pic is right after i finished it no pics with optic but i put a pa 1x6 in a American Def qd mount

https://i.imgur.com/kmL0Gbh.jpg
Thanks! Looks good
Link Posted: 12/15/2019 10:20:06 AM EST
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Originally Posted By Ironcross:

Thanks! Looks good
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No problem , thanks its quickly becoming my go to. Its got a great balance
Link Posted: 12/30/2019 9:03:34 PM EST
Can anyone explain why my mlok rail came with 3 screws and the instructions say 3 screws to install, but the rail only has a spot for 2 screws and no center hole? Is this a mistake or are there multiple designs floating around?
Link Posted: 12/31/2019 12:19:56 AM EST
[Last Edit: 12/31/2019 12:22:34 AM EST by brx123]
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Originally Posted By Atticus1354:
Can anyone explain why my mlok rail came with 3 screws and the instructions say 3 screws to install, but the rail only has a spot for 2 screws and no center hole? Is this a mistake or are there multiple designs floating around?
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Doesnt sound right is it new or a older rail ? Can you post a pic. I would also send Corrie a email she would know for sure and if theres something wrong she'll get you squared away.
Link Posted: 12/31/2019 4:09:08 AM EST
[Last Edit: 12/31/2019 4:11:55 AM EST by Atticus1354]
Its purchased straight from them a month ago so I would hope it's new. I have an email in to them also.

Link Posted: 12/31/2019 5:02:48 AM EST
Never seen one like that , im sure theyll take care of you
Link Posted: 12/31/2019 11:55:50 AM EST
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Originally Posted By Atticus1354:
Its purchased straight from them a month ago so I would hope it's new. I have an email in to them also.

https://i.imgur.com/xACSqgYl.jpg
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That's how the OEM Centurion handguards look but usually the OEM version doesn't have the QD slot like this.

I wonder if they decided the 3rd screw wasn't necessary? IIRC it's not even torqued down just screwed in until flush and I think I remember there being something in the instructions about over tightening and messing something up, I wonder if it was just more trouble than it was worth?

Anyway please let us know.
Link Posted: 12/31/2019 11:58:22 AM EST
Apparently they have upgraded the design to just use 2 screws and a newly designed spacer. My box just had the new rail and the old screw pack/instructions. Updated parts are getting shipped out to me now.
Link Posted: 12/31/2019 12:02:54 PM EST
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Originally Posted By Atticus1354:
Apparently they have upgraded the design to just use 2 screws and a newly designed spacer. My box just had the new rail and the old screw pack/instructions. Updated parts are getting shipped out to me now.
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That's good the 3rd screw seemed like a wonky design to me.
Link Posted: 12/31/2019 4:02:19 PM EST
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Originally Posted By Atticus1354:
Apparently they have upgraded the design to just use 2 screws and a newly designed spacer. My box just had the new rail and the old screw pack/instructions. Updated parts are getting shipped out to me now.
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Glad its just a new design hope everything works out well
Link Posted: 1/29/2020 10:19:52 AM EST
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..

Attachment Attached File
Link Posted: 1/30/2020 12:47:40 AM EST
[Last Edit: 2/29/2020 11:02:46 AM EST by mhbaker81]
I gave a preview of this build up above and also in the Official Weapon Mounted IR Laser Pic Thread. There's a ton of customization on this fuck the libtards / "other fiream" and many parts will be easily identifiable from the photos. Key takeaway: it is tight inside the rail, but there is plenty of clearance after trimming a few of the MLOK screws. Some items of note are:

- Aero Upper Receiver
- 11.5" Ballistic Advantage Barrel
- SLR Rifleworks Gas Block
- 10.5" MLOK CMR Rail
- PSA Stealth Lower
- Vltor A5H2 Receiver Extension Kit
- Laser Devices ITAL (IR) with Larue LT-271 mount
- Modified Streamlight clicky tapeswitch for constant on capability with a momentary only laser
- Cloud Defensive LCS
- Modified Tango Down T2 Cover





Link Posted: 1/31/2020 11:51:34 AM EST
Link Posted: 2/2/2020 11:35:00 AM EST
Changed up my build a little bit by adding a Vortex UH-1 and installing a VLTOR A5 system. Hopefully I'll get to test it this week work willing.

12.3 Hanson barrel
11.5 handguard
Attachment Attached File
Link Posted: 2/10/2020 8:40:15 PM EST
[Last Edit: 2/10/2020 8:45:05 PM EST by Atticus1354]
Thinking about a 13.7" fsp build with solgw nox and the c4 mlok 12" fsp rail. Anyone have any idea how everything will line up? Want to be sure there is plenty of room to mount my sandman can on the end.

Also as you will see upthread I had a small problem with an order. They sorted me out quickly and efficiently and have made a fan out of me.
Link Posted: 2/19/2020 2:29:48 AM EST


Factory Colt LE6920-EPR CK Enhanced Patrol Rifle conversion kit complete upper half with 13.5" Centurion MLOK, 16" M4 gov't profile barrel, M-16 auto C & MPC marked bolt carrier group and charging handle that I got last October.

BCM MLOK panels, Magpul BUIS and Vortex Sparc AR optic.

My lower half was made in 2016 Colt LE6920 M4 carbine with Colt ambi selector, Magpul MOE K-2 grip and B5 Systems Enhanced SOPMOD stock.
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