IWS6 6MM SILENCER 1/2X28 BLK Manufacturer Model Number: IWS6 Manufacturer: IWI - Israel Weapon Industries Model: IWI Silencer 6MM Caliber: 5.56mm | 6mm Type: NFA - Silencer Item Type: NFA Finish: Black Overall Length: 6.4" Weight: 18 oz. Shipping Weight: 1.0 Feature: 1/2x28 HUB+ Mount Feature: Reduced Back Pressure Design Feature: No Barrel Restrictions Optic Adjustable Objective: false Optic Reticle Illuminated: false