Audere Hmb Muzzle Break .30 5/8-24 Matte Black. Specifications for Audere Hmb Muzzle Break: Manufacturer: Audere Color: Matte Black Projectile Caliber: .30 Caliber Finish: Oxide Threads per Inch: 5/8x24 Dimensions: 1.55 X 2.65 X 4.65 in Features of Audere Hmb Muzzle Break Reduces recoil and muzzle movement Package Contents: Audere Hmb Muzzle Break Audere FR0003: Hmb Muzzle Break .30 5/8-24 Matte Black