The Px4 is built around a modular concept so these pistols can be adapted to different needs. 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 milstd-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. The Bruniton non-reflective black coating is offer superior resistance against corrosion and wear.