Reliability and simplicity have made GLOCK G17 Semi-Auto Pistol one of the most widely used sidearms in law enforcement worldwide. The GLOCK G17 is a full-size service pistol, shooting the 9x19mm pistol cartridge (9mm Parabellum), a standard military round that's easy to find ammo for anywhere. The GLOCK 17 is a short-recoil operated, striker fire pistol. The GLOCK G17 Semi-Auto Pistol is an ultra-reliable handgun that is easy to learn how to operate and maintain, making it an ideal choice for self-defense, whether it be fin the field, at home, or on duty. The model G17 comes with two standard 17-round magazines or two 10-round magazines that comply with various city or state restrictions on magazine capacity.