The Glock G31 Gen 4 is a polymer framed pistol with a built in accessory rail. Featuring interchangeable back straps the grip of the G31 Gen 4 is stippled to reduce slippage while also having finger groves and thumb rests to aid in this effort. Chambered in 357 SIG the G31 Gen 4 has a 151 capacity and a reversible magazine catch. With a barrel length of 4.48 the Glock G31 Gen 4 weighs just 33.2 ounces when loaded. DetailsThe GLOCK 31 Gen4 in .357 introduces revolutionary design changes to the pistol thats 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 shooters 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 10BLACK FINISH