ALPHA DIRECT THREAD MT 1/2X28 Manufacturer Model Number: AC633 Manufacturer: SilencerCo Model: Harvester Thread Mount Type: Accessory-Muzzle Brakes Item Type: Accessory Weight: .10 Shipping Weight: 0.1 Feature: 1/2x28 Optic Adjustable Objective: false Optic Reticle Illuminated: false