The Glock 19 Gen 4 in 9mm introduces revolutionary design changes to the world’s most popular pistol. 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, Gen 4 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. The Glock 19 Gen 4 9x19mm pistol also retains the Glock accessory rail for your attachments.