eight inch cmmg 9mm SBR
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Check your firing pin see if it's turning into a pencil tip. It took four bolts before cmmg admitted they had a problem. I have the same SBR
Watch some of my other videos on my mk9 with gemtech multimount 9. It runs like a champ
I've been running this weapon completely factory stocked from cmmg. I ran Tula 115 grain, American Eagle 147 grain, freedom munitions 147 grain reman, armscor 115 reman and magtech through it. I would stick to factory specs to be on safe side.