SIERRA 5 KM 5.56MM SILENCER KEYMO MOUNT|KEYMO FLASH HIDER Manufacturer Model Number: SIERRA5KM Manufacturer: Dead Air Armament Model: Sierra 5 KM Caliber: 223 Rem | 5.56 NATO Type: NFA - Silencer Item Type: NFA Finish: Cerakote Body/Nitrided Muzzle Overall Length: 6.27" Weight: 15.4 oz. Shipping Weight: 1.0 Feature: KeyMo Adaptor| 1/2-28 Keymo FH Feature: Flash Hider Front Cap Optic Adjustable Objective: false Optic Reticle Illuminated: false