ASR MUZZLE BRAKE 5.56 1/2X28 1/2X28 TPI Manufacturer Model Number: AC142 Manufacturer: SilencerCo Model: Specwar Muzzle Brake Caliber: 223 Rem | 5.56 NATO Type: Accessory-Muzzle Brakes Item Type: Accessory Finish: Matte Black Shipping Weight: 0.3 Feature: 1/2x28 Thread Pattern Feature: Allows for QD for Specwar Sup Feature: .224 CAL Optic Adjustable Objective: false Optic Reticle Illuminated: false