DPM Springfield XDS / Mod2 3.3in Telescopic Recoil Reduction System 9mm/.45ACP. The 3 springs of the system are aligned and gradually compressed so as to offer an elastic effect of the slide travel and to control the movement of the slide so it never rams on the frame. The system includes 3 external springs all with different power rates with the longer spring always being the stronger so the shooter can fine tune the pistol recoil with different type of ammunition according to his/hers personal standards. Specifications for DPM Springfield XDS / Mod2 3.3in Telescopic Recoil Reduction System: Manufacturer: DPM Fabric/Material: Spring Steel Gun Make: Springfield Armory Gun Model: Springfield Armory XD-S Package Contents: DPM Springfield XDS / Mod2 3.3in Telescopic Recoil Reduction System What firearm models does the manufacturer say DPM Springfield XDS / Mod2 3.3in Telescopic Recoil Reduction System is compatible with? The manufacturer says that DPM Springfield XDS / Mod2 3.3in Telescopic Recoil Reduction System is compatible with Springfield Armory XD-SDPM TRS-SPR/9: Springfield XDS / Mod2 3.3in Telescopic Recoil Reduction System 9mm/.45ACP