Aero M4E1-E Complete Upper, 16" 5.56 Mid Barrel, EM12.7 - Ano Out of stock. Check back later... $645.00 MSRP Price: $579.99 Notify me when this item is back in stock (log in required) Description Details Reviews Shipping info UPC: 815421020922Manufacturer: Aero PrecisionModel: APAR640231M7Category: PartsOtherUpper receiverStock: 0Unit/Measure: EA This item may be shipped directly to your home address, unless you live in a restricted state.