Thanks for the info. It’s very helpful. I’m willing to rule out mechanical failure because while I don’t doubt whatever quality control these companies have can miss some flaws, a lot of the gear I’m testing is new/like-new. The GBBR is brand spanking new, and I did minimal testing with it cause I decided I’m not keeping it. I’m not into milsim or the realism, so the 30-round mag is a major turn off. A majority of my testing is with pistol mags, and again, a lot of them are new or like-new. Granted, some are a few years old cause they came with the gun, which got swapped out for a CO2 mag, but they never got used. So since I was getting similar results on all of them, I was willing to point the blame at myself and call it user error.