I'm up to about 1100 rounds on my Glock 42. I've fed it as many types of fmj and jhp i could and to date only had 2 stoppages. Both were from the same box of some fmj ammo I picked up from a local big box store. It was branded as Field and stream packaged in 50rd boxes. I've chalked it up to that ammo as I've never had a bobble otherwise. Great shooting lil pistol...