OpticsPlanet Exclusive Strike Industries Strike Micro QUAD V Threaded 9mm Compensator 1/2x28 Black. The 'V' stands for vertical as it's designed to kill all vertical movement of the muzzle when firing your handgun. This new and longer compensator's main difference from its original design (the Quad Comp) is that it will work right out of the box with your pistol without any tuning required. Previously the original Quad Comp needed some tuning of the guide rod's recoil spring depending on the platform. Additionally the original Quad focused on killing fore and aft movement reducing perceived felt recoil. The new Quad Comp V features two large vertical ports for gas to exit from and despite being 1.44" in length its aesthetic design aid in weight reduction so this won't feel cumbersome on the user at all when installed. We tested the new Quad Comp V on a G17 and G19 and saw virtually no muzzle rise. Put it this way if you've been wanting to build an "Open Division" gun this is a fantastic muzzle device to get for it Specifications for OpticsPlanet Exclusive Strike Industries Strike Micro QUAD V Threaded 9mm Compensator: Manufacturer: Strike Industries Color: Black Caliber: 9mm Luger Threads per Inch: 1/2x28 Gun Model: Glock 17 Glock 19 Universal Length: 1.44 in Width: 0.67 in Features of OpticsPlanet Exclusive Strike Industries Strike Micro QUAD V Threaded 9mm Compensator Micro compensator for any threaded 9mm handgun barrel Compatible for 1/2"-28 thread pitch Two large vertical ports Secure tight fitment and easy timing Aesthetic Strike design and lightweight Package Contents: OpticsPlanet Exclusive Strike Industries Strike Micro QUAD V Threaded 9mm Compensator 1x MC-V comp 1x Flat Head Torx M4x12mm 1x T20 Torx tool 1x Loctite What firearm models does the manufacturer say OpticsPlanet Exclusive Strike Industries Strike Micro QUAD V Threaded 9mm Compensator is compatible with? The manufacturer suggests that OpticsPlanet Exclusive Strike Industries Strike Micro QUAD V Threaded 9mm Compensator is compatible with Universal Glock 19 Glock 17Strike Industries SI-MC-QUAD-V: OpticsPlanet Exclusive Strike Micro QUAD V Threaded 9mm Compensator 1/2x28 Black