The Flash Hider by Q is a Quickie Fast-Attach flash hider compatible with the Pork Chop and Short Chop silencers by Q; 1/2x28 features 3/4" flats for easy install and removal.These flash hiders do not have a tapered thread.1/2-28 (8.6) SPECS:WEIGHT: 2.1 oz.OVERALL LENGTH: 2.13 inchesMATERIAL: 17-4 Stainless SteelTHREADS: 1/2-28 (8.6)