DPM Recoil Reduction System USP Compact 3.58in Barrel 9mm. The third spring which is contained within the rod controls the movement of the slide so it never rams on the frame. Package Contents: DPM Recoil Reduction System What firearm models does the manufacturer say DPM Recoil Reduction System is compatible with? The manufacturer suggests that DPM Recoil Reduction System is compatible with Ruger MAX-9 Springfield Armory XD-M Elite 9mm 3.8in Springfield Armory XD-E Heckler & Koch USP Compact Kimber KDS9cDPM MS-H&K/5: Recoil Reduction System USP Compact 3.58in Barrel 9mm