CMR sold out everywhere?

[LMMzach]

Anyone have a lead on a 14" cmr rail? I can't seem to find one tho weapon outfitters says they have one I'm thinking they just didn't update the site because everything else cmr related is sold out. They also don't accept the type of card I have.

Might just end up getting a nsr. Want something small lightweight and round for the most part to wrap my hand around comfortably.

Thanks

[GOST]

Stonefire Arms has them in stock.

[LMMzach]

Have you done buisness with them before?

[GOST]

No, but there is reviews on TOS.

[UWone77]

Just spoke to Centurion, they are shipping out more rails to dealers right now. Snow storm has halted shipment this week. You can wait to see when your favorite dealer has one if you're not comfortable.

[LMMzach]

Great! Thank you much

[schambers]

Weapon outfitters has a 14" as well

[LMMzach]

Weapon outfitters doesn't take my type of card:/

[UWone77]

Weapon outfitters doesn't take my type of card:/

Bummer... Weapon Outfitters is one of the top places I order from. Great people. Don't have a buddy you can have order it for you and you pay him?

[GOST]

You ought to call Weapon Outfitters and see if they would take a money order.

[mustangfreek]

Stonefire arms is more then good to go, during the panic, they were getting in receivers and bcg's and selling for normal prices and i ordered many and the owners wife would call me about once a week letting me know when more where coming in and if i wanted more.

great people!!

[GOST]

There you go Mustangfreak has spoken. Another three during the panic that were great were Primary Arms, Joe Bob Outfitters and Rainier Arms.

[LMMzach]

Rainier is my go to mostly. Maybe I'll give this stonefire a try tho. Even tho UW said they will be everywhere soon I'm a little impatient

[GOST]

Patience is not a virtue, but rather a mythological beast like unicorns.

[LMMzach]

Haha yes! I ordered it from stone fire couldn't take it got a few other goodies also.

[GOST]

What's it going on?

[LMMzach]

16" rainier build. Will post in explain ar thread when finished

[LMMzach]

Got an email today from stonefire saying my rail shipped. They seem to be on top of things.

[mustangfreek]

Got an email today from stonefire saying my rail shipped. They seem to be on top of things.

Ya dwayne and his wife are really nice people and always shipped fast when i ordered thru them..

[LMMzach]

Got my cmr thing is sick!


but I ran into this
http://img.tapatalk.com/d/14/02/09/ezu6y6e6.jpg

The rail fits over the gas block but once bolted it touches the bottom of it is that going to be an issue? There is plenty of room on the top side. It is a fortis low pro

[GOST]

I'd heard that some lo pro GB's wouldn't work with rail, but never had seen it it till now. I honestly don't know if this is an issue, it'll take one smarter than I to answer this.

[Slippers]

There's a lengthy cmr info thread on m4c where it gets mentioned more than a few times. Only the centurion gas block and a shaved fsb clear without problems, although I did recently see a user who had problems with the set screw sticking out too far on his centurion gas block because his barrel wasn't dimpled. Some people get away with various other gas blocks but it's hit and miss, no consistency to it.

General consensus is to file/grind the bottom of the gas block a little so you get at least a 10th of an inch clearance.

[UWone77]

What kind of barrel are you using?

I've got 2 lo-pro's installed on CMR's, but don't have this issue. I'll have to double check which lo-pro's and barrels I'm using.

[LMMzach]

It is a rainier arms mountain series 16"

[Slippers]

Just to follow up regarding gas blocks and fitment issues:

Assuming your barrel is perfectly centered in the rail, a 0.750" diameter barrel at the gas block will leave 0.1850" of clearance between the bottom of the barrel and the inside of the CMR.

A 0.625" diameter barrel at the gas block will leave 0.2475" of clearance between the bottom of the barrel and the inside of the CMR.

You can then measure the thickness of the bottom of various gas blocks and get a general idea of whether they will work or not.

Mike at ROG was nice enough to measure a few 0.750" gas blocks at the bottom and had these measurements:

YHM: 0.186" (I measured this one)
Noveske: 0.187"
Diamondhead: 0.185"
BCM: 0.186"
Vltor (set-screw): 0.187"
Geissele: 0.265

Anything around 0.185" *might* work if you get lucky and your barrel sits a little high inside the CMR. Of course, any slight pressure on the handguard might cause it to contact the gas block...

Here are some actual experiences from end users:

YHM low pro doesn't fit without grinding: http://www.m4carbine.net/showthread.php?130407-Centurion-Modular-Rail-(CMR)-picture-and-info-thread-(add-your-pics)&p=1802666#post1802666

Noveske low pro needs to be grinded as well: http://www.m4carbine.net/showthread.php?130407-Centurion-Modular-Rail-(CMR)-picture-and-info-thread-(add-your-pics)&p=1795390#post1795390

Parallax low profile gas block seems to have a sliver of clearance, but any flex of the rail means it'll probably hit: http://www.m4carbine.net/showthread.php?130407-Centurion-Modular-Rail-(CMR)-picture-and-info-thread-(add-your-pics)&p=1687749#post1687749

Sadlak .625 gas block works fine: http://www.m4carbine.net/showthread.php?130407-Centurion-Modular-Rail-(CMR)-picture-and-info-thread-(add-your-pics)&p=1680268#post1680268

Geissele gas block hits the bottom: http://www.m4carbine.net/showthread.php?130407-Centurion-Modular-Rail-(CMR)-picture-and-info-thread-(add-your-pics)&p=1672232#post1672232

Vltor gas block hits the bottom: http://www.m4carbine.net/showthread.php?130407-Centurion-Modular-Rail-(CMR)-picture-and-info-thread-(add-your-pics)&p=1661229#post1661229

Rainier Arms gas block hits the bottom: http://www.m4carbine.net/showthread.php?130407-Centurion-Modular-Rail-(CMR)-picture-and-info-thread-(add-your-pics)&p=1668297#post1668297

Black River Tactical micro pin gas block has a tiny bit of clearance, but you should still probably grind it down: http://www.m4carbine.net/showthread.php?146347-Geissele-gas-block-fit-under-Centurion-CMR-rail&p=1841202#post1841202

Stickman mentions a few times in the M4C thread that his BCM gas blocks work, but have very little clearance.

[LMMzach]

Great response thank you. I have a friend with the proper tools to grind a nice flat edge on my gas block.

I don't want it touching personally. But what is the problem with it touching? Just noise or will it affect the shooting of the rifle since I guess it's not technically free float then

[Slippers]

I don't want it touching personally. But what is the problem with it touching? Just noise or will it affect the shooting of the rifle since I guess it's not technically free float then

Exactly, it won't be free floated any longer if it's touching. Even if it's really close you risk having the handguard hit it if you flex it at all, such as if you sling up to pull the rifle in tight. Anything touching the barrel/gas block in an inconsistent manner will change your point of impact at distance.

[LMMzach]

Little update for anyone who cares. I got a buddy to mill down my fortis block for me did an amazing job. Had to cut the bolts tho I'm not really thrilled about that part but we will see how it works. Here's a couple I phone shots there is a lot of room in there now
http://img.tapatalk.com/d/14/02/13/haba5uga.jpghttp://img.tapatalk.com/d/14/02/13/etyhy7a5.jpg

[GOST]

Very nice, I will be needing pics of the whole rifle.

[UWone77]

I finally checked my CMR with the Fortis gas block. Much like LMMzach's picture, mine is also touching the rail. I haven't noticed any issues when shooting it, and didn't even think to check until I saw this thread.

I went ahead and took the rail off to see if there was any "rubbing" between the gas block and rail, but I could not locate any obvious wear marks. The rail slides on and off without issue.

This doesn't seem to be an issue with a .308 CMR/barrel/gas block.

[LMMzach]

Yes it seemed to only touch once the rail was bolted in place. Plenty of room taking it on and off

[GOST]

If anyone else is looking for a 14" CMR Tier One Arms has them for $285 with free shipping.

[LMMzach]

Finished the rifle going to shoot this weekend if weather permits http://img.tapatalk.com/d/14/02/20/yhyryvy5.jpg

Always feel like a chump posting pictures on here next to all the amazing photos

[UWone77]

Nice build LMM, I like the SRS.

What are the full specs?

[GOST]

Your rifle looks awesome. How do you like SRS?

[LMMzach]

Thank you it has been a super fun process building this rifle

Started with a rainier stripped forged lower and complete rainier forged upper
Rainier 16" mountain series barrel
Fortis gas block ( had to mill it to fit under cmr)
14" cmr
Palmetto lower parts kit with moe grip and trigger guard
Geissele SD-C trigger
Magpul CTR stock and MBUS
Damage industries buffer kit
Inforce Haley strategic WML
A2 flash hider and finally the Trijicon SRS


I haven't got to shoot the rifle yet plans are Friday I'll try to get better photos while I'm out and post in the explain rifle thread


The SRS got a killer deal on it so couldn't pass it up. huge sight window clear glass( tho it does seem to magnify a tiny bit just by the quick looking through it I did walking around the house?) bright dot quick detach is flawless pretty simple controls and it seems like it can take a beating feels real solid. The glass sits in pretty far so I'm hoping there is not any glare while shooting in light even tho it's so big.

I'll give a better synopsis once I get to use it

[GOST]

Very cool, looking forward to hearing about how the rifle handles and the SRS. Been interested in trying out a SRS on my new rifle.