YHM A3 Upper Receiver Assy | YHM-100

The Yankee Hill Machine (YHM) A3 Upper Receiver Assembly (YHM-100) is a forged, machined upper designed for use on AR-15 platform rifles. It is machined in-house from 7075-T6 aluminum and finished with an anodized coating. The assembly includes M4-style feed ramps, a dust cover, and a forward assist, and is built to accept standard upper receiver parts and mil-spec lower receivers. Typical applications include range use for maintenance or upgrades and competition or practical shooting builds.

Product Specifications

• The UPC for this product is 816701011319.
• The manufacturer is Yankee Hill Machine.
• The model is listed as A3 Upper Receiver.
• The part number is YHM-100.
• The material is machined from 7075-T6 aluminum.
• The finish is Anodized.
• The assembly includes a dust cover and forward assist.
• It features M4-style feed ramps and “T” markings.
• It is designed to accept standard upper receiver parts.
• It is compatible with mil-spec lower receivers.
• The product type is categorized as an Upper for AR-15 platforms.
• The overall dimensions are 2.90 x 5.20 x 13.25 inches.
• The height is 2.9000 inches.
• The width is 5.2000 inches.
• The length is 13.2500 inches.

This A3 upper provides a durable, serviceable foundation for builders and shooters who want a straightforward, mil-spec-compatible upper assembly. Its forged 7075-T6 construction and anodized finish deliver corrosion resistance and long-term durability, while the M4-style feed ramps and compatibility with standard parts make installation and maintenance uncomplicated. Whether you are updating a range rig or assembling a competition-oriented rifle, the YHM A3 upper balances reliable construction with practical features.