This magazine is intended for use in compact sized XD-M Elite 10mm models. The included magazine sleeve, as noted, aligns with the installed backstrap already on the pistol creating a seamless transition from compact to full size and allowing the user extra capacity in a compact platform.Features :Magazine with Sleeve #1 Needs to be Used with Backstrap #1Requires Removal of Magwell Effectively Converts the Grip from Compact to Full Size