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Yankee Hill Machine (YHM) A3 Upper Receiver Assembly – AR-15
The YHM A3 Upper Receiver Assembly (YHM-100) is a professional-grade foundation for any AR-15 build, known for its exceptional "made in-house" quality. Unlike many brands that outsource their forgings and machining, Yankee Hill Machine handles 100% of the manufacturing process in their Massachusetts facility. This A3-style flat-top upper is forged from 7075-T6 aluminum, providing a much higher strength-to-weight ratio than billet alternatives. It arrives as a complete assembly, meaning the forward assist and ejection port door are factory-installed, saving you time and ensuring every small part meets YHM's strict tolerances.
The YHM-100 is engineered with M4-style feed ramps to enhance feeding reliability, especially during high rates of fire or when using suppressed systems. The interior of the receiver is coated with a dry film lubricant, which reduces friction on the bolt carrier group and extends the service life of the rifle. Finished with a Mil-Spec Type III hardcoat anodize and featuring laser-etched "T-marks" on the top rail for repeatable optic placement, this receiver is a "buy once, cry once" component that has been a favorite of the tactical community for over two decades.
Includes: (1) Assembled A3 Upper Receiver, factory-installed Forward Assist, and factory-installed Ejection Port Door (Dust Cover).
Key Features
- 100% In-House Machining: YHM controls the entire manufacturing process to ensure consistent quality and perfect fitment with Mil-Spec lowers.
- Forged 7075-T6 Aluminum: Offers superior structural integrity and durability compared to cast or billet receivers.
- Dry Film Lube Interior: A specialized internal coating that ensures smooth cycling of the BCG and resists carbon fouling.
- M4 Feed Ramps: Precision-cut extensions that facilitate reliable feeding of 5.56 NATO, .223 Rem, and .300 Blackout rounds.
- Laser-Etched T-Marks: Clear, high-contrast markings on the Picatinny rail allow for precise, repeatable mounting of scopes and red dots.
- Complete Factory Assembly: Comes ready to install out of the box; no need to source or install small upper parts kits.
Product Specifications
- Brand: Yankee Hill Machine (YHM)
- Model: A3 Upper Receiver Assembly
- Material: Forged 7075-T6 Aluminum
- Finish: Type III Hardcoat Anodized (Matte Black)
- Feed Ramps: M4 Style
- Platform: AR-15 / M4 / M16
- Internal Coating: Dry Film Lubricant
- Weight: 0.54 lbs (8.64 oz)
- MPN: YHM-100
- UPC: 816701011319
