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Rainier Arms flattop upper receiver minus forward assist is carefully machined to mil-spec to serve as a great foundation for a quality AR rifle.
- Made from 7075 - T6 aluminum
- Type III hard coat anodized
- Matte black finish
- Dry lube coating: Inside to reduce wear and adds lubricity
- "T - Marked" engraved
- M4 Feed Ramp
- Upper Parts Kit Not Included - Available here