Tiger Rock AR-10 .308 Birdcage Muzzle Brake for 5/8"x24 Pitch - 5 Ports. 308 5 port muzzle brake is precision machined and hard anodized to create a tough muzzle device that will provide remarkable results. The 5 ports created by the compact design of the unit help to reduce recoil significantly which in turn will keep you on target. It is important to note that strict dimensional standards exist for all of our muzzle brakes. To guarantee this we CNC machine each brake to specific notches and then add a layer of anodized black coating. This provides a consistent and predictable performance that we are proud of. Additionally each brake ships with a 5 port gasket which ensures effective gas distribution to the ports. Hard Anodized Black Finish. Specifications for Tiger Rock AR-10 .308 Birdcage Muzzle Brake for 5/8inx24 Pitch 5 Ports: Manufacturer: Tiger Rock Condition: New Package Contents: Tiger Rock AR-10 .308 Birdcage Muzzle Brake for 5/8inx24 Pitch 5 Ports Tiger Rock MBR05-308: AR-10 .308 Birdcage Muzzle Brake for 5/8"x24 Pitch - 5 Ports