The Glock 27 Gen4 in 40SW 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. Its modular back strap design lets you instantly customize the grip to adapt to an individual shooter's hand size. The surface of the frame employs the scientifically designed, real-world-tested, Gen 4 rough textured technology. Internally, the 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.