DPM SIG Sauer P320 M18 CALIFORNIA - STANDARD VERSIONDPM Mechanical Recoil Reduction System for SIG P320 M18 CALIFORNIA STANDARD VERSION SKU: 1000356 EAN: 5213007223562 MPN Code: MS SI 39 The DPM Mechanical Recoil Reduction System is a direct replacement for the stock recoil rod and does not change the configuration of the pistol. The spring plug must always be installed when the DPM Recoil Rod and springs are used. **As we lead the evolution of recoil reduction technology, products may change versions