The TSG-22 quickly and easily converts Generations 1 through 4 of the Glock models 17/22 and 19/23 into an accurate .22LR pistol. Machined from a solid piece of heat treated 4140 steel the TSG-22 maintains a similar weight and feel to your factory Glock allowing realistic shooting and training. A nitride surface treatment offers superb resistance to wear and surface friction. - The TSG-22 fits snugly onto your Glock frame in just seconds. As with our other conversions the savings on ammunition will make you glad you made the switch. 10 Round Magazine Included. - Does not fit Glock Gen 5 pistols. - Fits Glock® models 17 22 34 35 and 37. Gen 1-4 - 1-16 Twist - 1/2x28 Threads - 4.4 Length - 12.8oz Weight - Factory Glock® Sights - 10 Round Magazine