Sylvan Arms Muzzle Device 223 Remington/ 5.56x45mm NATO Threaded 1/2x28 Black. 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. Specifications for Sylvan Arms 223 Remington/556NATO Flash Hider: Manufacturer: Sylvan Arms Color: Black Caliber: 5.56x45mm NATO .223 Remington Finish: Black Threads per Inch: 1/2x28 Features of Sylvan Arms Muzzle Device 223 Remington/556NATO Threaded 1/2x28 17-4 Stainless Steel Heat treated after machining Nitride Black surface treatment Package Contents: Sylvan Arms Muzzle Device 223 Remington/556NATO Threaded 1/2x28 Sylvan Arms Muzzle Device 223 Remington/556NATO Threaded 1/2x28 1/2x28 Black SA223QD