usually a gun will jam if you don't have a tight enough grip on it.

they call it "limp-wristing" it...not saying you're ghay...just if you don't lock your wrist & elbows the gun doesn't have enough force to slam forward on the recoil & it'll jam.

my girl did that alot when i first started to teach her to shoot. she would flinch just as she pulled the trigger & unlock her wrist & it'd jam. when i held her wrists, it wouldn't.