The 417 Gen 4 Single Port compensator is a thread on compensator designed for select Glock Gen 4 models. It features a 1 chamber design ( 1 vertical venting port). It is designed to work with threaded barrels with a 1/2x28 thread pitch (Overall barrel protrusion should be 0.695" +/- 0.005" for optimal fitment). It features a front sight hole allowing you to transfer your existing front sight from your slide to the compensator. It is compatible with the G17, G19 and G34. (Not compatible with conversion barrels). Please note compensator may require tuning of the recoil system. It is designed to work with most factory loaded ammunition but will yield the best results with a heavier charged ammunition. Specifications for Agency Arms 417 Glock 17/19/34 Gen4 Single Port Compensator: Manufacturer: Agency Arms Cartridge: 9mm Luger Fabric/Material: 7075 Aluminum Gun Make: Glock Gun Model: Glock 34, Glock 17, Glock 19 Model Generation: 4 Weight: 1.7 oz Included Accessories: Set Screws, Allen Wrench, Vial of Red Loctite Condition: New Features of Agency Arms 417 Glock 17/19/34 Gen4 Single Port Compensator: 1 Chamber Design (1 vertical port) Front Sight Hole 7075 Aluminum Mil Spec Type III Hard Anodized Included Accessories: 417 Comp (Generation specific) 2 Set Screws with an Allen Wrench Vial of Rocksett Package Contents: Agency Arms 417 Glock 17/19/34 Gen4 Single Port Compensator 29 Set Screws Allen Wrench Vial of Red Loctite