DPM Mechanical Recoil Reduction System for Smith & Wesson M&P M2.0 3.6" Compact  The DPM Mechanical Recoil Reduction System is a direct replacement for the stock recoil rod and does not change the configuration of the gun.  This system works due to the multi spring intricate rod (3 springs) and controls the functionality of the gun. The third spring which is contained within the rod controls the movement of the slide so it never rams on the frame. Included with the system are 3 separate springs so the user can fine-tune the weapon for his/hers personal standards. The longer spring (more coils) is stronger and has a heavier pound rating than the shorter spring. **As we 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.**  Power Rates Slide on the battery (idle position): Short: 9lbs - 4.0 kg   Medium: 10lbs - 4.5 kg  Long: 11lbs - 5 kg Slide full open position: Total power:  21 lbs - 9.5 kg  approx. Overall Advantages 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