Windham Upper, 223 Rem/556NATO, 16" M4 Barrel, Bayonet Lug and A2 Birdcage, Fits AR Rifles, Chrome Lined Chamber, A3 Sights, Black Finish UR16M4LHB Out of stock. Check back later... $570.00 MSRP Price: $516.00 Notify me when this item is back in stock (log in required) Description Details Reviews Shipping info UPC: 848037002419Manufacturer: Windham WeaponryModel: UR16M4LHBCaliber: 223 RemCategory: PartsOtherUpper receiverStock: 0Unit/Measure: ea This item may be shipped directly to your home address, unless you live in a restricted state.