The 5.56 NATO caliber Accu-Tac Flash Hider by Wilson Combat is the ideal choice for reducing muzzle flash. Its three-pronged external accurizing flutes provide improved muzzle harmonics, allowing you to get more accuracy and stability out of your firearm. Made with hardened 4140 steel and a matte black melonite coating, this flash hider is designed to last. It comes compatible with a 5/8"x24 thread pitch for easy installation on most .30 caliber firearms. With the Accu-Tac Flash Hider by Wilson Combat, you’re sure to get the most out of your shooting experience. Get yours now! Material: Hardened 4140 Thread: 1/2" x 28 Length: 2.200" Diameter: .865" Weight: 2.4 oz. Finish: Matte black melonite Caliber: 5.56 x 45mm/.223 Remington Bore Diameter: .485" Inlcudes crush washer