The Beretta Px4 Storm is a semi-automatic pistol manufacture by Beretta of Italy and intended for personal defense and law enforcement use. The Px4 uses the same short-recoil, rotating barrel lock as the Beretta 8000 Models and uses exactly the same Operating System as the M9/92/96 series, while being completely different in design from either. Light-weight polymer construction with steel inserts, a modular trigger group, fully enclosing slide, Picatinny rail on the chin, and changeable backstrap options for the grip are a radical departure from previous Beretta designs.