CMMG AR-15 M4 LE A3 Flat-Top Upper Assembly 300 AAC Blackout 1 in 7" Twist 16" Barrel Carbine Gas System CM with M4 Handguard, Single Rail Gas Block, Flash Hider
I used a CMMG barrel in my .300 BLK build. It's been one of the most accurate rifles I own. I can't speak for the rest of the parts they use, or for their build quality though.
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