The Yankee Hill Machine 125 Billet Lower Receiver (part no. 125BILLET) grew out of YHM’s Model-57 styling exercise, a deliberate move away from a lower that mimics a standard forged receiver toward a more distinctive billet look. Machined from 7075-T6 aluminum and finished in a hardcoat anodized matte black, this 5.56x45mm NATO lower features an oversized magazine well chamfer for easier magazine changes and a built-in, oversized machined trigger guard. It fits all standard AR-15 parts and standard upper receivers, and ships stripped, requiring a lower parts kit, buffer, and stock of your choosing to complete.

Key Specifications

• Machined from 7075-T6 aluminum with YHM’s distinctive Model-57-inspired billet styling.
• Finished with a hardcoat anodized matte black coating.
• Chambered for 5.56x45mm NATO AR-15 pattern uppers.
• Features an oversized magazine well chamfer for easier magazine changes.
• Includes a built-in, oversized machined trigger guard.
• Accepts all generations of PMAGs and Mil-Spec upper receivers.
• Fits all standard AR-15 parts aside from a separate trigger guard.
• Ships as a stripped receiver, ready for your lower parts kit and stock.

Frequently Asked Questions

What makes the styling different from a standard lower? YHM designed this billet lower with a more distinctive look, moving away from mimicking a standard forged receiver.

Does it accept PMAGs? Yes, it accepts all generations of PMAGs as well as standard Mil-Spec magazines.

Does it ship with internal parts? No, it ships stripped and requires a lower parts kit, buffer, and stock to complete.

Buy the Yankee Hill Machine 125 Billet Lower Receiver

Build on distinctive Yankee Hill Machine styling. Browse more AR-15 lower receivers and order from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.