Aimtech bases are manufactured from the finest quality heat-treated aluminum alloy extrusion, machined on American-made CNC machining centers. No gunsmithing required, and iron sights remain usable. Uses Weaver-style rings (not included).Glock Models 20 & 21 ONLY
Material: Heat-treated Aluminum Alloy
NO GUNSMITHING REQUIRED.
This is a saddle type mount. It attaches to both sides of the gun.