The Yankee Hill Machine A3 Upper Receiver Assembly (brand part number YHM-100) is a complete flat-top upper receiver machined from aluminum for AR-15 builders, shipping with the forward assist and dust cover assembly already installed. YHM cuts M4-style feed ramps and factory T markings into the receiver and coats the interior with a dry film lubricant to reduce friction and wear. It accepts standard AR-15 upper receiver parts and mates up with any mil-spec lower receiver, giving builders a solid, ready-to-assemble foundation.

Key Specifications

• Machined from aluminum.
• Ships with the forward assist and dust cover assembly already installed.
• Cut with M4-style feed ramps and factory T markings.
• Interior coated with dry film lubricant to reduce friction.
• Accepts standard AR-15 upper receiver parts.
• Mates up with any mil-spec AR-15 lower receiver.

Frequently Asked Questions

Does this include the forward assist and dust cover? Yes, both ship already installed.

Will it fit any AR-15 lower? Yes, it mates with any mil-spec AR-15 lower receiver.

Buy the Yankee Hill Machine A3 Upper Receiver Assembly

Start your build on a ready-to-assemble upper with the hard parts already installed. Order it from our Yankee Hill Machine lineup, part of our AR-15 uppers selection, at our Lubbock, Texas gun shop for fast, direct shipping.