Mine worked better loading only 9 rounds in the magazine. It was ammo spilled out of the factory box into a box. Been there years. No kaboom, for me yet but it ftf a few times and fte a couple also. But its really accurate, at 7 yards its shooting very well. A nickle or quarter group is doable, or smaller, hand held for a magazine. 25 yard headshots with 5 shots are doable, hand held too. And thats with crappy old ammo. And a horrible heavy glock trigger. Im not complaining, but it needs breaking in. Mines a keeper.