$49.992-Piece grips for SWD M-11/9 and M11-A1 (the MAC that takes the Zytel magazines) submachineguns and semi-auto pistols. Do not know if it will fit the post-ban semi-auto ball detent grips. The 2-Piece grips will not fit the sten converted magazine wells. This grip features one finger groove, ribs on the front, stippling on the sides, is more rounded on the backstrap than the stock grip and extends lower. It also features a "mag funnel" on the bottom. The thickness around the front and sides of the grip is only about 0.059" thick (similar thickness as the metal in the M-11/9 upper receiver) except over the stippling and front ribs where it is a little thicker. Additionally, the rounded backstrap also makes for a more comfortable grip. Material is a hard plastic polymer, not rubber. Grip is two pieces and attaches with your existing grip screw.