The Glock 27 Gen4 introduces revolutionary design changes to this small, light, accurate, and powerful pistol that so many law-enforcement agencies have issued as their official backup weapon. The Modular Back Strap design of the G27 Gen4 lets you instantly customize its grip to adapt to an individual shooter's hand size. The surface of the frame employs the scientifically designed, real-world-tested, Gen4 rough textured technology. Internally, the Glock dual recoil spring assembly substantially increases the life of the system. A reversible, enlarged magazine catch, changeable in seconds, accommodates left- or right-handed operators. Three 9-round magazines are included.