Standard Frame 1911s only (Commander compatible), NO double stacks or compact frames. The ReCover 1911 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 1911 grips can be installed without the need for a gunsmith, and requires no permanent modifications to be made to your firearm.