Rearden SPB Features The Rearden SPB Muzzle Brake uses a square port design to redirect propellant gas as it exits the muzzle countering muzzle rise and reducing the felt recoil transmitted back to the shooter. Its .375 bore size accommodates a range of medium and larger caliber rifles built on a 5/8x24 thread pattern making it a versatile option across multiple platforms. Heat treating the steel body improves its resistance to the repeated thermal and mechanical stress of firing helping the brake hold its dimensions and thread engagement over years of use. At a compact 1.73 inches overall length and 2.30 oz the SPB adds minimal length or weight to the muzzle end of a rifle. Compatibility with the Atlas Atlas XL and Plan B mounting systems means this brake integrates directly with those modular muzzle device platforms without requiring an adapter. That modularity lets a shooter swap between a bare brake and a compatible suppressor mount without removing the base unit from the barrel. The gold finish gives the SPB a distinctive look that sets it apart from the black muzzle devices most rifles ship with while the heat treated steel underneath keeps performance consistent regardless of finish. For shooters running a 5/8x24 threaded barrel who want effective recoil control in a compact modular package the Rearden SPB is available for sale at GrabAGun. Rearden SPB Specifications Manufacturer: Rearden Model: SPB Type: Muzzle Brake Color: Gold Material: Steel Finish: Heat Treated Bore Size: .375 Thread Pitch: 5/8x24 Length: 1.73 Compatible Hosts: Atlas / Atlas XL / Plan B Weight: 2.30 oz Available At: GrabAGun