Reliability and simplicity have made GLOCK® G19 Gen 3 Semi-Auto Pistol one of the most widely used sidearms in law enforcement worldwide. The G19 is a mid-size pistol, shooting the 9x19mm pistol cartridge (9mm Parabellum), a standard military round that's easy to find ammo for anywhere. The GLOCK 19 is a short-recoil operated, striker-fire semi-automatic pistol. The Safe-Action trigger system makes shooting in stressed situations infallible. The main frame of the GLOCK pistol is constructed of high-strength polymer that is resistant to shock, caustic liquids, and temperature extremes. The milled steel slide and the barrel are treated with matte black Tenifer finish for extreme resistance to wear and corrosion.