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.
|Type||Complete Gas Impingement|
|Series||Enhanced Upper Receiver|
|Sights||None, Optic Ready|
|Caliber||223 remington556 nato|
|Handguard Finish||Black Hard Coat Anodized|
|Receiver Description||7075-T6 Aluminum|
Determined at checkout.