The GLOCK 31 Gen4 in .357 introduces revolutionary design changes to the pistol that's been the optimum solution for those seeking high muzzle velocity and superior precision in a reliable yet lightweight pistol with large magazine capacity. 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. The G31 Gen4 .357 retains the GLOCK accessory rail for your attachments. - Length: 202 mm / 7.95 in. - Width: 30.00 mm / 1.18 in. - Length Between Sights: 165 mm / 6.49 in. - Height: 138 mm / 5.43 in. - Barrel Height: 32 mm / 1.26 in. - Barrel Length: 114 mm / 4.48 in. - Weights: Unloaded: 740 g / 26.12 oz.-Loaded: 940 g / 33.18 oz. - Trigger Pull: ~2.5 kg / ~5.5 lbs. - Trigger Travel: ~12.5 mm / ~0.49 in. - Barrel Rifling: right hand hexagonal - Length of Twist: 250 mm / 9.84 in. - Magazine Capacity: Standard: 15 Optional: 10