DPM Arex Zero 1 Version Standard 4.25in & Tactical 4.9in Mechanical Recoil Reduction System, Stainless, MS-AREX/1

The third spring which is contained within the rod controls the movement of the slide so it never rams on the frame. Also included with the system are 3 different in length and strength springs so the user can fine-tune the weapon for his/hers personal standards.