SIERRA 5 XM 5.56MM SILENCER XENO MOUNT | XENO FLASH HIDER Manufacturer Model Number: SIERRA5XM Manufacturer: Dead Air Armament Model: Sierra 5 XM Caliber: 223 Rem | 5.56 NATO Type: NFA - Silencer Item Type: NFA Finish: Cerakote Body/Nitrided Muzzle Overall Length: 5.72" Weight: 13.3 oz. Shipping Weight: 1.0 Feature: Xeno Adaptor | 1/2-28 Xeno FH Feature: Flash Hider Front Cap Optic Adjustable Objective: false Optic Reticle Illuminated: false