Yhm A3 Upper Receiver Assy Blk

The Yankee Hill Machine A3 black upper receiver assembly is a fully machined, forged-aluminum upper built to mil-spec standards for serious AR-15 shooters and builders. YHM manufactures these uppers entirely in-house from 7075-T6 aluminum, so you're getting tight tolerances and consistent quality without the supply-chain guesswork that comes with outsourced parts. If you're building an AR platform rifle for hunting, competition, or patrol duty, a quality upper is the foundation—and this one won't let you down.

The A3 upper accepts all standard upper receiver components and pairs with any mil-spec lower receiver, making it a straightforward drop-in for custom builds or rifle upgrades. M4-style feed ramps ensure reliable feeding across common ammunition types, and the hardcoat anodized matte black finish is applied to military specifications for durability in field conditions. The upper ships assembled with a forward assist and dust cover, so you're ready to mount your bolt carrier group and charging handle.

Every YHM upper is coated inside with a dry film lubricant to reduce friction and ease cleaning. That attention to detail—machining in-house, proper surface treatment, functional design—is what separates a purpose-built upper from a generic one. Whether you're running a lightweight DMR, a duty rifle, or a hunting platform, this receiver will hold zero and cycle reliably for years.

Key Features

• 100% in-house machined from 7075-T6 forged aluminum for precision and durability
• M4-style feed ramps for reliable feeding
• Hardcoat anodized matte black finish to military specifications
• Compatible with all standard upper receiver components and mil-spec lower receivers
• Forward assist and dust cover assembly included
• Interior dry film lube coating for reduced friction and easier maintenance
• T-marked charging handle reference for proper bolt operation

Specifications

Frequently Asked Questions

Will this upper work with my AR-15 lower receiver?

Yes. The YHM A3 upper is designed to accept standard mil-spec lower receivers. If your lower is mil-spec, this upper will fit without modification.

What comes assembled on this upper?

The forward assist and dust cover assembly are installed and ready to use. You'll need to add your own bolt carrier group and charging handle to complete the upper.

Is the interior coated or treated?

Yes. The interior is coated with a dry film lubricant to reduce friction during operation and make cleaning easier.

Who manufactures this upper?

Yankee Hill Machine Co machines and assembles the A3 upper entirely in-house, ensuring consistent fit, function, and quality control.