had a rain day today. after emailing ballistic advantage, couldn't stand the wait, was going to order 6arc head space guages so ordered .556 guages also. these have been sitting here for a week. today i checked head space on .556 ballistic advantage barrel and just like @98Z5Vsaid the 556 no-go would not chamber. put the pistol together (3oz buffer & white springco recoil spring) took it out to shoot for function and sight in. i shot green tip 62gr had bolt lock back, 3 o'clock to 4 ejection worked perfect. now the next problem. i thought this pistol would make a great tracter & truck gun, so i tried the 55gr v-max load that i shoot in my full size ar's and it will not load second round, no bolt lock back.
thought about increasing gas hole size or maybe try loading a 60gr v-max, maybe that would increase dwell time enough. i mostly shoot at varmints, won't shoot full metal jackets at them.