RUGER SR 40 Compact arsenal The system works due to

The system works due to the multi spring intricate rod (three springs) and acts like a brake on the slide

Water Proof

The system includes 2 external springs

1 spare washer and 3 external springs

The external springs are different in length

RUGER SR 40 Compact arsenal The system works due toDPM Mechanical Recoil Reduction System for Ruger SR 40 Compact 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. 1 spring plug and 2 separate external springs are included with the system. The springs are different in length with the longest being the heaviest when the slide