Our M4 Mil-Spec Plus, flat-top upper receivers are precision CNC machined from 7075-T6 aluminum forgings for maximum durability and Mil-Spec Type 3 hard coat anodized in rugged black. Whether you are building a match upper or a complete tactical rifle, quality starts with the upper receiver. This receiver comes unmarked for a clean, custom look.
- Machined To MilSpec+ Tolerance
- M4 style feedramps
- No forward assist or ejection port cover installed