This SCT Manufacturing GLOCK(TM) Compatible Full Size Assembled Frame is going to change the way you build pistols. It is the only frame at this price point packed with this level of features. This is a serialized frame with shooter-oriented ergonomics. Polished stainless steel over molded rails that are ready to build. They are made with an industry leading proprietary polymer blend and compatible with Glock Gen 3 17,22, and 31 frames. Each frame is assembled by a certified armorer utilizing SCT Manufacturing lower parts kits which have been tested and proven to meet or exceed OEM specifications. The last step of each frame assembly is function testing utilizing a GLOCK(TM) fac Mfg: Sct Manufacturing