DPM Shadow Systems MR920/DR920/XR920/Elite 9mm Open Version Recoil Reduction System. This DPM System works with 3 different buffer recoil springs which each one offers different spring force (Forces are listed at the end of the description). The installation of the New Version remains the same as the older one the user has to assemble the mechanism and select the combination of his/hers choice. The Self-lock spring plug must always be installed when the DPM kit is used. 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/ DR920/ XR920 / Elite 9mm Open Version Recoil Reduction System: Manufacturer: DPM Fabric/Material: Spring Steel Gun Make: Shadow Systems Gun Model: Shadow Systems MR920 Elite Shadow Systems DR920 Shadow Systems XR920 Shadow Systems MR920 Features of DPM Shadow Systems MR920/ DR920/ XR920 / Elite 9mm Open Version 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/ DR920/ XR920 / Elite 9mm Open Version Recoil Reduction System What firearm models does the manufacturer say DPM Shadow Systems MR920/ DR920/ XR920 / Elite 9mm Open Version Recoil Reduction System is compatible with? The manufacturer says that DPM Shadow Systems MR920/ DR920/ XR920 / Elite 9mm Open Version Recoil Reduction System is compatible with Shadow Systems MR920 Shadow Systems XR920 Shadow Systems DR920 Shadow Systems MR920 EliteDPM MS-SS-1: Shadow Systems MR920/DR920/XR920/Elite 9mm Open Version Recoil Reduction System