This is the micro UNIVERSAL compensator with a similar form function as a thread protector but offers the same recoil reduction as a compensator! Please note that this fits most 9mm pistol setups. This fits subcompact and full size handguns. However, some of the longer barrels like on a Sig P320, it will not sit up against the slide and have a gap. Pay close attention to the protrusion of the barrel and where the threads end AND start on said barrel you install this on. It will make the difference between the comp looking like it belongs on the gun vs. awkwardly sticking off the front. Eliminates approximately 25% of muzzle flip depending on what platform it is installed on. Product Features Designed to work with most 1/2-28 threaded 9mm barrels. 4 different Tension lock o-rings for hand-tight installation to prevent back off.* The multi-port design is identical to our HCAT but smaller than our HC9C. The overall length is .874". Outside width at widest: .775" Product Specifications Material: 7075 Aluminum Finish: FBlack Anodize finish Compatibility: Most 9mm handguns with a 1/2-28 threaded barrel! (will not fit 2011 bull barrels) Included: 4 O-rings Length: .874 inches long - .775 inches wide