Fits standard frame 1911s only no double stacks or compact frames.The recover grip and rail systems have proven to be the most stable rail solutions on the market as well as the most popular and are easily installed on your gun and under 3 minutes.The high-grade lightweight glass-reinforced polymer recover can be installed without the need for a gunsmith and requires no permanent modifications to be made to your firearm.The recover 1911 grips are the simplest way to update the look of your 1911 while providing fully a functional picatinny railRails: PicatinnyMaterial: Polymer