They shot like regular ammo. First, I shot with just one in the mag and it locked open like it should. Since I had swapped out buffer, I was also checking to see if I needed to adjust gas block. Everything was fine with the the cycling and feeding. No problem there. But it was crazy how they were all over the place. I put in 5 pmc soft points and they cycled good too. Grouped about 1”. Then I put in some 168 grain Hornady Black and they cycled good too. And the groups were dime size with them. Gun is good and I am happy with the new buffer and spring. When I bought that ammo, the LGS said if I had any problems with ammo bring it back and he would swap me out. He probably knew it was junk. No misfiring and no cycling problems but darn sure not accurate. I would say that my buffer and gas block are going to be fine if it shoots junk and good ammo too with no feeding problems at all.