There are at least 3 different radius cuts used on 1911 style pistols. Some use a .250 radius (like Wilson), a few (like Caspian and Springfield) use a .220 radius, and then there is the original Colt mil spec. GR4 makes a Beavertail grip safety compatible with Springfield. A grip safety from Caspian will fit the radius, also.Unless the frame was altered the grip safety should be a drop in part









