These grips will not work with Double Action Only (DAO) Pistols. With the old grip off, hook the top of the grip panel under the top of the handle and with little pressure press the lower portion into place. Do not force the grip into place. If there is any interference remove that material with a fine file and taper the back edge to allow the grip to swing into place. Place the screw into the frame handle and snug the grip screw against the grip.