I received a CMMG barrel a few weeks ago but due to health issues just got around to assembling an upper. Set up carbine length test fired for function with Winchester 145 gr FMJ factory loads ($8.99) it fired slightly over gassed for ejection and ran 11 rounds through it flawlessly . Used 10 round CMMG magazines fed perfectly. will mount a scope on this later today and see what's what....
