These mounts from C-MORE Systems allows you to mount the STS Red Dot Sight to your handgun. Mounting Kits include a dovetail adapter, slide adapter, sight adapter plate all wrenches and screws needed, and an adhesive strip. The adhesive strip prevents movement of the slide adapter and prevents marking of the slide. Glock Wide Slide fits Glock models 20, 21, 29, 30, 36, 37, 38, 39. Glock Narrow Slide fits Glock Models 17, 19, 22, 23, 25, 26, 27, 28, 31, 32, 33, 34, 35. Mfg: C-More Systems