Shaw Titanium Muzzle Brake .2231/2x28 Threads Gray. 6 ounces. 2 large side ports and 4 smaller top vents virtually eliminate muzzle rise and significantly reduce felt recoil. Bottom is sealed for reduced dust signature when shooting in the prone position. Available threaded 1/2x28 for .223 cal and 5/8x24 for .308 cal. Specifications for Shaw Titanium Muzzle Brake: Manufacturer: Shaw Color: Gray Projectile Caliber: .223 Caliber Caliber: .223 Remington Fabric/Material: Titanium Threads per Inch: 1/2x28 Condition: New Last Chance: Yes Features of Shaw Titanium Muzzle Brake Material type/finish: Grade 5 Titanium Matte Caliber: .223 Thread Dimensions: 1/2x28 Package Contents: Shaw Titanium Muzzle Brake Crush washer Shaw ACMDSHAWTI556: Titanium Muzzle Brake .2231/2x28 Threads Gray