The GLOCK 34 Gen4, in 9x19, introduces revolutionary design changes to the "Tactical/ Practical" GLOCK designed to be the same overall length as the Government Model 1911 pistols. The Modular Back Strap design lets you instantly customize its grip to adapt to an individual shooter's hand size. The surface of the frame employs the new scientifically designed, real-world-tested, Gen4 rough textured technology. Internally, the new 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. Also available in MOS configuration..