DPM Shadow Systems CR 920 Combat/Elite Recoil Reduction System. The Washer is an optional installation for cosmetic reasons not mandatory. 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 CR 920 Combat / Elite Recoil Reduction System: Manufacturer: DPM Fabric/Material: Spring Steel Gun Make: Shadow Systems Gun Model: Shadow Systems CR920 Features of DPM Shadow Systems CR 920 Combat / Elite 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 CR 920 Combat / Elite Recoil Reduction System What firearm models does the manufacturer say DPM Shadow Systems CR 920 Combat / Elite Recoil Reduction System is compatible with? The manufacturer suggests that DPM Shadow Systems CR 920 Combat / Elite Recoil Reduction System is compatible with Shadow Systems CR920DPM MS-SS-2: Shadow Systems CR 920 Combat/Elite Recoil Reduction System