The GLOCK 27 Gen4, in 40 S&W, introduces innovative design changes to this small, light, an accurate and powerful pistol that so many U.S. law enforcement agencies have chosen as their official backup weapon. The Modular back strap design and the reversible magazine catch make it possible to instantly customize its grip to accommodate any hand size. The surface of the frame employs the new Gen4 rough textured technology. A reversible enlarged magazine catch, easily changeable accommodates left and right-handed operators.