Beretta's Px4 Storm features an exclusive Beretta-designed locked breech with a rotating barrel system that reduces felt recoil and muzzle rise. The chrome-lined barrel provides extreme corrosion resistance and ease of cleaning, and it also features a deeply-recessed combat muzzle crown to protect the rifling. The light yet durable frame employs modern thermoplastic technology through the use of technopolymer-reinforced fiberglass and features an integral Picatinny MIL-STD rail. The Px4 Storm has an ambidextrous safety/decocking lever and a reversible magazine release, and it may be configured with a small, medium, or large backstrap for individual fit (3 backstraps included). The modular structure, ergonomics, and interchangeability of parts make the Px4 Storm the ideal firearm for law enforcement use and personal defense.