This SCT Manufacturing GlockA(R) Compatible Full-Size 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. Installed over-molded rails that are ready to build. They are made with an industry leading proprietary polymer blend and compatible with GlockA(R) Gen 3 17,22, and 31 frames. Other Features Include: Serrations and index point on trigger guard to help control recoil Serrations on top of beaver tail reduce glare GEN 5 Style Slide lock (spring included) Flared mag well Thumb Accelerator pad Advanced contour Mfg: Sct Manufacturing