Aero M4E1-E Complete Upper, 20" 5.56 Rifle Barrel, EM15 - Ano Out of stock. Check back later... $675.00 MSRP Price: $609.99 Notify me when this item is back in stock (log in required) Description Details Reviews Shipping info UPC: 840014603183Manufacturer: Aero PrecisionModel: APAR640251M48Category: PartsOtherUpper receiverStock: 0Unit/Measure: EA This item may be shipped directly to your home address, unless you live in a restricted state.