Beretta JXF9F51 Px4 Storm Inox 9mm 4" 17+1 Blk Poly Grip/Frame SS Inox Slide The full size Px4 Inox brings a fresh look and unique style to the Px4 family, epitomizing functional elegance for the most demanding shooters. The stainless steel slide is bead blasted to a smooth satin finish, ensuring a non-reflective surface that is highly resistant to the elements. The Px4 features an exclusive, Beretta-designed locked breech with rotating barrel system, reducing felt recoil and muzzle rise. Chrome-lined barrels provide extreme corrosion resistance, as well as ease of cleaning and feature a deeply recessed combat muzzle crown to protect the rifling. The light frame employs a durable fiberglass-reinforced polymer with a Mil Std-1913 Picatinny rail and a modular grip system for a custom fit. The manual lever safety and slide stop lever are both ambidextrous while the magazine release button is reversible.