Hogue Rubber Grip, S&W 5900 Series, No Finger Grooves, Black 40010 This grip is the S&W 5900 Series rubber grip panels. These 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.