The Sylvan Arms 5.56Nato/ .223 muzzle device is designed to be used in conjunction with the Osprey 5.56Nato Titanium Suppressor. This muzzle device features a common 1/2x28 thread pitch to attach to your 5.56Nato or .223Rem firearm. Made of 17-4 Stainless steel, this flash hider features ratchet notches for the Osprey Suppressor to tighten down on for a secure fit. If you have multiple 5.56Nato firearms to mount your Osprey to, this muzzle device is the perfect solution. It will also fit with the .30cal Warthog Suppressor from Sylvan Arms. Features : 1/2x28 Threading Made of 17-4 Stainless Steel