Could be cheap ammo too. One time I shot some ammo where I guess the casings were softer metal than normal and no lie, every shot, the casing would get caught in the part where it’s suppose to fly out and it would get pinched by the slide and crumble like a beer can. Garbage as Walmart ammo.there’s many reasons why a gun would jam up. Could be failure to feed, double feed...failure to extract... Bad ammo, dirty gun, dirty mags. We don’t know what kind of magazine he had or what occurred during that incident. All those could happen with OEM Magazines