DPM Sig Sauer P220 Elite-Legion-Hunter-Supermatch Mechanical Recoil Reduction System 10mm Auto/ .45ACP EliteLegion Hunter / Supermatch 5in Barrel. These external springs are different in length (also in power) so the user can fine-tune the system to serve all possible shooting needs. The longer spring (more coils) is stronger and has a heavier pound rating than the shorter springs. The spring plug with the marked groove is offering a heavier buffer effect and the spring plug with flat surface offers a lighter buffer effect (slide full open position). 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. The spring plug must always be installed when the DPM Recoil Rod and springs are used. Specifications for DPM Sig Sauer P220 Elite-Legion-Hunter-Supermatch Mechanical Recoil Reduction System: Manufacturer: DPM Fabric/Material: Spring Steel Gun Make: SIG Sauer Gun Model: SIG Sauer P220 Features of DPM Sig Sauer P220 Elite-Legion-Hunter-Supermatch 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 Sig Sauer P220 Elite-Legion-Hunter-Supermatch Mechanical Recoil Reduction System What firearm models does the manufacturer say DPM Sig Sauer P220 Elite-Legion-Hunter-Supermatch Mechanical Recoil Reduction System is compatible with? The manufacturer says that DPM Sig Sauer P220 Elite-Legion-Hunter-Supermatch Mechanical Recoil Reduction System is compatible with SIG Sauer P220DPM MS-SI/22: Sig Sauer P220 Elite-Legion-Hunter-Supermatch Mechanical Recoil Reduction System 10mm Auto/ .45ACP EliteLegion Hunter / Supermatch 5in Barrel (127.0mm) 8 Adjustable Settings