Hi, I have a brand new R9s, havent even shot it yet. While racking the slide, every so often the barrel pin pops out just a little from the left side, jamming the slide open about a half inch. I have to push on the pin again to get the slide to go into battery. I have tried to tap the pin in extra snug just to make sure its seated, but still once in a while, it pops out just a little. The pin does seem to be rather loose in the cross barrel hole. Any suggestions?