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.
|Complete Gas Impingement
|Enhanced Upper Receiver
|None, Optic Ready
|223 Remington/5.56 NATO
|Black Hard Coat Anodized
Determined at checkout.