Fits models: 5903 5904 5906 5944 5946 5943 4006 4046 4096 410 411 910 915etc. - Will not fit frame decocker models with a 2 or 7 in third digit such as 5676 4026 etc. - Our grips are a two piece that replaces the one piece stock grip. These grips are a straight backstrap design that installs using a mainspring retainer and screws which come with the grip. The mainspring retainer is pinned into position with the pin that holds the stock grip on. The mainspring retainer provides the threaded bosses that the grip panels screw into.