Yankee Hill Machine Co. Model-57: Precision Lower Receiver for AR-15

Building a reliable AR-15 starts at the lower receiver. For builders who want a durable, ergonomic foundation with a distinctive look and real-world functionality, this billet lower balances form and function without adding unnecessary gimmicks.

YANKEE HILL MACHINE CO BILLET LOWER RECEIVER

YANKEE HILL MACHINE CO billet lower receiver angled view

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Materials and finish

This lower is machined from 7075-T6 aluminum, a standard for high-strength firearm components where stiffness and weight savings matter. The hardcoat anodized matte black finish provides corrosion resistance and a tactical, low-reflective appearance that will hold up under range use and in the field.

Design highlights

Oversized magazine well

The oversized magazine well chamber is engineered to speed magazine changes and reduce fumbling during stress drills. It accepts all generations of PMAGs, making it an adaptable choice whether you run newer polymer mags or legacy magazines.

Trigger guard and parts compatibility

YHM’s built-in, oversized machined trigger guard improves access when wearing gloves and adds rigidity to the lower. The receiver fits all standard parts except for an aftermarket trigger guard—installers should plan to source a complete lower parts kit, buffer, and stock to finish the build.

Fitment and compatibility

The lower was designed to mate seamlessly with Mil‑Spec upper receivers. That compatibility lets you mix and match handguards, barrels, and bolt carrier groups while keeping a consistent lower that performs reliably. The design lineage traces back to YHM’s intent to break from the “every other AR” aesthetic, influenced by the Model-57 concept for a more stylized, purposeful profile.

Price: $251.09 — a competitive figure for a 7075-T6 billet lower with hardcoat anodizing and ambidextrous-aware geometry. View product details and pricing.

YANKEE HILL MACHINE CO billet lower receiver magazine well detail

Who should consider this lower

Competitive builders, tactical shooters, and anyone upgrading from a forged lower will appreciate the combination of 7075-T6 strength, a refined trigger guard, and faster reload ergonomics. Remember that the lower ships as a bare receiver — plan for a lower parts kit, buffer assembly, and stock to complete your build. Check current availability.

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People Also Ask

What makes this product stand out from competitors?

This product offers superior quality and innovative features that set it apart in the market. Its design focuses on both performance and reliability, making it a top choice for professionals and enthusiasts alike.

Is this product suitable for beginners?

Yes, this product is designed with user-friendly features that make it accessible to beginners while still offering advanced capabilities for experienced users.

What warranty or support is available?

The product comes with comprehensive warranty coverage and excellent customer support to ensure your satisfaction and peace of mind.

How does this compare to similar products in its price range?

This product offers exceptional value for its price point, providing features and quality that typically cost significantly more in comparable alternatives.

What maintenance is required?

Minimal maintenance is required thanks to the product’s durable construction and quality materials. Regular cleaning and occasional inspections will keep it performing optimally.

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