The DPM Captured Mechanical Recoil Reduction system it is made for the Walther PDP model for all barrels 4" , 4.5" and 5".  

The above system works due to the multi spring intricate rod (three springs) and in some cases the system offers almost double force in the slide at the end of full open position, compared with the factory OEM spring and function like a buffer on the slide.

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
• Weight: 0.9 oz

Power Rates:

• Slide on the Battery: 4.5Kgs / 10Lbs
• Slide full open position: 10Kg / 22Lbs approx.

Compatible for:

• PDP SD Pro Compact 4.6” Barrel
• PDP SD Pro FS 5.1" Barrel
• P99 4'' & 4.2" Barrel