there is probably not enough gas int eh mag to make the slide go all the way back. most probably from yoru mags freezing up on you. try this .. fire full auto about 10 shots, wait a couple minutes, fire off 10 more shots, wait a couple minutes, then fire the rest.
if i'm right then the slide should lock back after all the ammo is gone. by a couple of minutes I actually mean use your watch and count 3 minutes. you can even take he mag out of yoru gun and hold it in your hand to warm it up a bit faster
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