The M4 Assembled Upper Receiver comes with an Enhanced Nitride port door with a 1 Pc. stainless Ejection door Retaining rod, and forward assist already installed. Expanded .458 socom ejection port for maximum efficiency. Forged from 7075-T6 aluminum, this assembled upper is precision machined to mil- spec M16/M4 specifications and features M4 feed ramps. Match this upper with one of your m4 lower receivers for a solid and dependable fit.
Features and Specs:Platform: AR15
Material: Machined from 7075-T6 forged aluminum
Coating: Matte black hard-coat anodized Mil 8625 Type 3 Class 2
- M4 Feedramps
- .250” take-down pin holes
- Accepts standard AR15/M16 components
- Expanded ejection port .458 socom specific