Springfield Armory XDM5002C Backstrap Sleeve made of Polymer with Black Finish & 1 Piece Design for 9mm Luger 40 S&W Springfield XD-M Compact with #2 Backstrap & 3.80 Barrel”

This backstrap sleeve fits over a full size XD-M magazine in 9mm or 40 S&W to make your 3.8 XD-M Compact pistol frame fit a high capacity full size magazine. This black polymer piece does not extend the length of the magazine.”