DPM Sig Sauer P226 X-Short Competition-Tactical Allround Mechanical Recoil Reduction System. As always DPM products are designed and developed with users safety as a priority. Exceptional manufacturing and engineering using high-end materials. This system works due to the multi spring intricate rod (3 springs) and controls the functionality of the pistol. The third spring which is contained within the rod controls the movement of the slide so it never rams on the frame. The Dark Grey spring plug is offering a heavier buffer effect and the silver spring plug offers a lighter buffer effect (slide full open position). The external springs are different in length so the user can fine tune the pistol on the opening and locking positions (slide on the battery) according to his/hers personal standards. The longer spring (more coils) is stronger and has a heavier pound rating than the shorter spring. Specifications for DPM Sig Sauer P226 X-Short Competition-Tactical-Allround Mechanical Recoil Reduction System: Manufacturer: DPM Fabric/Material: Spring Steel Gun Make: SIG Sauer Gun Model: SIG Sauer P226 Features of DPM Sig Sauer P226 X-Short Competition-Tactical-Allround 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 P226 X-Short Competition-Tactical-Allround Mechanical Recoil Reduction System What firearm models does the manufacturer say DPM Sig Sauer P226 X-Short Competition-Tactical-Allround Mechanical Recoil Reduction System is compatible with? The manufacturer says that DPM Sig Sauer P226 X-Short Competition-Tactical-Allround Mechanical Recoil Reduction System is compatible with SIG Sauer P226DPM MS-SI/13: Sig Sauer P226 X-Short Competition-Tactical Allround Mechanical Recoil Reduction System