Made in the usa, the apollo max sets the standard for performance by providing breakthrough recoil reduction and unparalleled muzzle compensation.Gases are strategically diverted away from the shooter and out of the shooters line of sight.Experience smooth, on-target recoil compensation in a competition-legal package.A timing nut is included for easy installation.Finish: Black NitrideModel: ApolloMaterial: 416 Stainless SteelThread Pattern: 5/8"-24 tpi