This high-end tech DPM Mechanism is a direct after market replacement of the factory (OEM) recoil rod and does not require any modification to the pistol. As always, DPM products are designed and developed with users safety as a priority. Exceptional manufacturing and engineering using also high-end materials. Specifications for DPM Gens 1-5 Telescopic Recoil System: Manufacturer: DPM Color: Stainless Fabric/Material: Stainess Steel Gun Make: Glock Model Generation: 5, 4, 3, 2, 1 Features of DPM Gens 1-5 Telescopic Recoil 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 Gens 1-5 Telescopic Recoil System