.308 80% Lower Receiver – Premium Billet Aluminum | AR-10 Compatible

About this product

Premium .308 80% Lower Receiver – Billet Aluminum Construction

Build your dream .308 AR-10 rifle with Polymer80’s precision-machined billet 80% lower receiver. Crafted from aerospace-grade 6061-T6 aluminum and finished with durable black anodizing, this premium lower receiver delivers exceptional strength and corrosion resistance for demanding shooting applications.

Key Features & Specifications

Material & Construction

• Material: Premium billet 6061-T6 aluminum
• Finish: Type III hard anodized black coating
• Weight: Optimized weight distribution for balance
• Machining: CNC precision-machined to mil-spec tolerances

Compatibility & Applications

• Platform: AR-10/LR-308 rifle builds
• Calibers: .308 Winchester, 7.62 NATO, 6.5 Creedmoor
• Parts Compatibility: Standard AR-10 lower parts kit required
• Magwell: Broached for precision magazine fit

Technical Specifications

• Fire Control Cavity: Requires completion machining
• Trigger Guard: Integrated heavy-duty design
• Bolt Catch: Threaded hole (pin sold separately)
• Serial Number Area: Unmarked for custom engraving
• QC Standards: 100% made in USA quality

Why Choose This .308 80% Lower?

For Custom Builders: This 80% lower receiver provides the perfect foundation for building a custom .308 rifle exactly to your specifications. The unmarked design allows for personalized engraving while maintaining full AR-10 compatibility.

For Performance Shooters: Billet construction offers superior strength-to-weight ratio compared to forged alternatives, making it ideal for precision shooting and long-range applications.

For Durability: The Type III anodizing provides exceptional wear resistance and corrosion protection, ensuring your build performs reliably in all weather conditions.

Completion Requirements

This 80% lower receiver requires machining to become a functional firearm component. Recommended tools include 80% jig, drill press or milling machine, carbide drill bits and end mills, and safety equipment.

Compliance Notice

This product complies with federal regulations as an unfinished receiver. Check local and state laws before purchase.