DPM Mechanical Recol Gen 5 Captured Version Reduction System Glock 17/22/31/34/35/37 Stainless MS-GLG5/1 Captured. The third spring which is contained within the recoil rod controls the movement of the slide so it never rams on the frame. This system includes 3 different in length Washers / Spacers. The longer Washer offers a heavy buffer effect moving to shorter Washer a lighter buffer effect is being offered so the shooter can fine tune the total force of the spring system according his/hers personal standards depends the type of ammunitions that using. Specifications for DPM Mechanical Recol Gen 5 Captured Version Reduction System: Manufacturer: DPM Color: Stainless Fabric/Material: Stainess Steel Gun Make: Glock Gun Model: Glock 35 Glock 34 Glock 22 Glock 17 Glock 37 Glock 31 Model Generation: 5 Condition: New Features of DPM Mechanical Recol Gen 5 Captured Version Reduction System User adjustability. Captured recoil rod. 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. Easier installation. Package Contents: DPM Mechanical Recol Gen 5 Captured Version Reduction System What firearm models does the manufacturer say DPM Mechanical Recol Gen 5 Captured Version Reduction System is compatible with? The manufacturer suggests that DPM Mechanical Recol Gen 5 Captured Version Reduction System is compatible with Glock 31 Glock 37 Glock 17 Glock 22 Glock 34 Glock 35DPM MS-GLG5/1 Captured: Mechanical Recol Gen 5 Captured Version Reduction System Glock 17/22/31/34/35/37 Stainless