Aero Precision APAR600201AC M4E1 Enhanced Upper Receiver 223 Remington/5.56 NATO Black Hardcoat Anodzied
Due to the unprecedented volume of firearms and ammunition sales, there could be a discrepancy between the displayed on-hand quantities for an item vs. the on-hand quantities available from our warehouse. Also these quantities do not reflect the inventory at our physical retail location.
Availability: Back Order
The M4E1 upper receiver is a one-piece design combining the handguard mounting platform with the upper itself. It is machined from 7075-T6 aluminum with, M4 feedramps, .250 takedown pin holes, and supports barrels with a diameter up to 1". Included is a barrel nut and wrench, port door and forward assist. This model has a black hardcoat anodized finish. NOTE: This upper is not piston-kit compatible.