DPM IWI Masada Striker Fired Pistol 9mm Mechanical Recoil Reduction System Stainless. 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 external springs so the user can fine-tune the weapon for his/her personal standards. The longer spring (more coils) is stronger and has a heavier pound rating than the shorter spring. Feel free to try any possible combination of the external springs to fine tune the pistol functionality depending the power of the ammunition is used. Specifications for DPM IWI Masada Striker Fired Pistol 9mm Mechanical Recoil Reduction System: Manufacturer: DPM Color: Stainless Fabric/Material: Steel Gun Make: Israel Weapon Industries (IWI) Gun Model: IWI Masada Condition: New Last Chance: Yes Barrel Length: 4.1 in Features of DPM IWI MASADA Striker Fired Pistol 9mm Mechanical Recoil Reduction System 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. Package Contents: DPM IWI MASADA Striker Fired Pistol 9mm Mechanical Recoil Reduction System What firearm models does the manufacturer say DPM IWI Masada Striker Fired Pistol 9mm Mechanical Recoil Reduction System is compatible with? The manufacturer says that DPM IWI Masada Striker Fired Pistol 9mm Mechanical Recoil Reduction System is compatible with IWI MasadaDPM MS-JE/5: IWI Masada Striker Fired Pistol 9mm Mechanical Recoil Reduction System Stainless