The Generation 4 GLOCK 17, in 9mm, introduces revolutionary design changes to the pistol that has found worldwide acclaim. The Modular Back Strap design lets you customize its grip to fit the shooter's hand size. Employs the new Gen4 rough textured technology. Internally, the new dual recoil spring assembly substantially increases the life of the system. A reversible enlarged magazine catch for left or right-handed operators. Retains the accessory rail. New in Box. Includes 4-17rd factory magazines, plastic carry case and other accessories. F1GLK17NGEN4