CMMG 8.5" 300blk

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chip12345
Member
Posts: 18
Joined: Thu Mar 19, 2015 3:36 pm

Re: CMMG 8.5" 300blk

Post by chip12345 » Thu Jul 21, 2016 5:19 pm

The GT 187's are particularly dirty and gassy Picked up some on discount, but no more. I will be interested to see hwo they cycle with my 8" CMMG barrel - just refit a DSA upper and other than having problems with FTE (maybe bolt?) it's a very good barrel.

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BlogSarge
Silent But Deadly
Posts: 1281
Joined: Mon Oct 21, 2013 11:10 pm

Re: CMMG 8.5" 300blk

Post by BlogSarge » Thu Jul 21, 2016 9:51 pm

The GTs are filthy. But they seem pretty accurate out of my 8" CMMG barrel and, at 50yds, almost exact same POI as my Lehigh 194 gr sub loads. So I put up with the fouling!

I don't think it is unburned powder. Maybe some type of filler for the low powder charge?

chip12345
Member
Posts: 18
Joined: Thu Mar 19, 2015 3:36 pm

Re: CMMG 8.5" 300blk

Post by chip12345 » Sat Jul 23, 2016 1:40 am

Hey, speaking of the 8.5, what weight buffer is recommended with the OE gas port? I did read that some were enlarging, but right now I'm trying to perfect Remmy supers through this setup with however this barrel was sent from the factory. With an H2 I was getting some random FTF. It was ejecting, but looked like the bolt was running over and not properly picking up rounds.

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