DPM Shadow Systems MR920/XR920/Elite 9mm Captured Version Mechanical Recoil Reduction System. This system offers almost double force at the end of full open position of the slide. Compared to the factory OEM spring provides additional force that stops the violent rams on the frame. As lead the evolution of recoil reduction technology products may change versions (new design with different springs with or without plugs washers etc.) without any prior notice. Specifications for DPM Shadow Systems MR920/XR920 / Elite 9mm Captured Version Mechanical Recoil Reduction System: Manufacturer: DPM Fabric/Material: Spring Steel Gun Make: Shadow Systems Gun Model: Shadow Systems MR920 Elite Shadow Systems XR920 Shadow Systems MR920 Features of DPM Shadow Systems MR920/XR920 / Elite 9mm Captured Version Mechanical Recoil Reduction System Faster follow up shots Improved firing speed Slide and Frame Protection Elimination of jams Significant recoil reduction Better double-tap concentration Better control and greater accuracy Package Contents: DPM Shadow Systems MR920/XR920 / Elite 9mm Captured Version Mechanical Recoil Reduction System What firearm models does the manufacturer say DPM Shadow Systems MR920/XR920 / Elite 9mm Captured Version Mechanical Recoil Reduction System is compatible with? The manufacturer suggests that DPM Shadow Systems MR920/XR920 / Elite 9mm Captured Version Mechanical Recoil Reduction System is compatible with Shadow Systems MR920 Shadow Systems XR920 Shadow Systems MR920 EliteDPM MS-SS-4: Shadow Systems MR920/XR920/Elite 9mm Captured Version Mechanical Recoil Reduction System