Tapco Self Timing Muzzle Brake Black. Made with heat-treated 4140 steel for strength and durability. With a thread pitch of 5/8 x 24 this brake seamlessly integrates into a variety of rifles. Specifications for Tapco Self Timing Muzzle Brake: Manufacturer: Tapco Color: Black Projectile Caliber: .30 Caliber Finish: Nitride Fabric/Material: 4140 Steel Weight: 0.27 lb Tapco TAP22046 Self Timing Muzzle Brake Black Nitride Steel 5/8"x24 Threads 30 C Tapco TAP22046: Self Timing Muzzle Brake Black