Springfield armory's backstrap sleeve is the perfect companion to using high capacity magazines with your xd-m 45acp compact with 3.8" barrel.It fills in the gap between the extended magazine base plate and the pistol grip giving shooters a solid one piece grip.Caliber: 45 ACPCapacity: XD(M) 45ACP 3.8" BarrelFinish: BlackModel: Backstrap SleeveMaterial: PolymerType: Magazine SleeveModel Fit: XD-M CompactBrand Fit: Springfield Armory