The m4e1 threaded upper receiver features an angular machined design that helps it stand apart from standard mil-spec upper receivers.It is threaded to accept a standard ar-15 barrel nut and forged from 7075-t6 aluminum and precision machined to work with all mil-spec ar-15 parts.The m4e1 features a picatinny profile, m4 feed-ramps, and.250 take-down pin holes.This model has a black hardcoat anodized finish.Note: this model does not include port door or forward assist.

Receiver Finish: Black Hard Coat Anodized
Type: Stripped
Caliber: 223 Rem
Sights: None, Optic Ready
Receiver Description: 7075-T6 Aluminum