took my new pm9 to the range today. fired 200 rounds of american eagle ball ammo. gun shot excellent, but every time i would fire the first round out of the 7 round extended mag the slide would hang up trying to chamber the second round. a slight bump on the slide would chamber the round. i would dismiss this if it happened once or twice but every single time?. anyone else have this issue when first breakin in your new pm9? thanks for any info. brad.