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