A buddy, of mine, a State Trooper was at the range Saturday in a fit of frustration. His Beretta 96 was locking to the rear with rounds still in the magazine. He was suspect of the magazines but not I. He's a left handed shooter which means his support hand is not getting in the way and bumping the slide stop on recoil. The only reason I could come up with was a weak slide stop spring which during recoil was "bouncing up" and locking the slide back. Any other ideas out there that could be causing the problem?