Beretta's px4 storm features an exclusive beretta-designed locked breech with a rotating barrel system which reduces felt recoil and muzzle rise.The chrome-lined barrel provides extreme corrosion resistance and 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.This 40 s&w model comes with a 10-round magazine.Frame Finish: BlackType: PistolAction: DA/SACaliber: 40 S&WBarrel Length: 4"Capacity: 10+1Safety: Ambidextrous/Firing PinGrips: Black w/Interchangeable BackstrapSight Configuration: 3-Dot WhiteWeight: 27.7 ozFrame Material: PolymerBarrel Type: Chrome-LinedSlide Description: SerratedCase Type: HardSight Style: ContrastBarrel Length Range: 4.00" to 4.99"Weight Range: 16.00 oz to 31.99 oz