The Glock 23 Gen4, in .40, introduces revolutionary design changes to the pistol that combines compact dimensions for both open and concealed carry, with minimum weight despite its large magazine capacity. The modular backstrap design 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 magazine catch, changeable in seconds, accommodates left- or right-handed operators. The G23 Gen4 in .40 caliber also retains the Glock accessory rail for your attachments.