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Discussion Starter · #1 ·
Just a placeholder, checking in with CMMG about getting barrels w/o a drilled gas port. I've had good service with their barrels. Chrome lined in 1:7 and 1:8 for their 18" barrels, might be a possibility for another custom ACR barrel project.

Alternatively, if you have a tax stamp on your rifle right now and don't want to alter the factory ACR mid-length piston set up you could get one of their 18" rifle length gas system barrels. If you cut it back to 12.5" you'll remove the existing gas port to give you a somewhat virgin barrel to work up. A faster twist would help projectile stability in the shorter barrel. I haven't found a medium contour 1:7 barrel that is chromed for the same project unless anyone else does.
 

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Discussion Starter · #2 ·
CMMG Barrels-Good news

Quoted reply in regards to question to ordering a barrel w/o a drilled gas port...

Yeah that's fine just let us know when you order you want it that way.

Thanks,
Jordan Bowles
--
CMMG, Inc
PO Box 369
Fayette, MO 65248
(660)248-2293
(660)248-2290 (FAX)
www.cmmginc.com



So there you go. If you're interested in a 1:7 or a 1:8, 5.56 NATO, chrome lined barrel for your ACR, here is an avenue to pursue. Barrel work in regards to fitting the gas block, gas port work and making necessary profile cuts should be minimal and something a company like Adco should be able to easily do.

14.5" & 16" options in 1:7. The 1:8 barrels are 18" only. And, you can get rid of the goofy M4 profile. If you so choose to undertake this noble effort make sure to doublecheck they haven't changed specs on their barrels and the mid length gas block location is the ACR's diameter. .750 IIRC.

http://cmmginc.secure-mall.com/shop/index.php?shop=1&cat=67
 

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Hmmmm, the options are opening up. Since Cmmg has annouced a 300aac option this might be the way to go. I hope that the freedom group will release some parts in the near future and we can start playing on our own. Thanks for checking into this, excellent info.
 

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Discussion Starter · #4 ·
The only thing that would concern me about running the 300BLK in the ACR at this point in time is that some of AAC's folks have made mention about pistol length gas. rsilvers on the xcrforum has been relating issues that might be present in making an XCR barrel in 300BLK.

I'm sure this is something that can be overcome with special parts or add-ons to the gas system (maybe a different bolt carrier w/ a built in, long stroke piston to connect to a special gas block under the handguards? --just thinking out loud, no words, rumors, truths spoken by this office!) but as of right now I think it would take some heavy modification to the existing factory parts to get up and running.
 

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Thinking about it, since the ACR doesn't really used an adjustable gas system, (other then surpressed / unsurpressed) maybe something can be made to turn on and off under the handguard. One pin gives you easy access to it. Different bolt carrier would increase cost, but is definately workable. One thing I like about this industry, someone somewhere will eventually figure something out.
 
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