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.. Category. :. Uppers. Type. :. Complete Gas Impingement. Caliber. :. 223 Remington/5.56 NATO. Sights. :. None, Optic Ready. Receiver Description. :. 7075-T6 Aluminum. Receiver Finish. :. Black Hard Coat Anodized
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