Springfield Armory's X-Tension magazine sleeve is the perfect companion to using high capacity magazines with your XD(M) 45ACP Compact with 3.8" barrel. The X-Tension Sleeve fills in the gap between the extended magazine base plate and the pistol grip giving shooters a solid, one piece grip. For XD(M) 45 ACP Compact shooters, this is an essential item when using high capacity mags.