Polymer80 LR-308 80% Lower Receiver – AR-10 Platform Build Kit

Polymer80 LR-308 80% Lower Receiver: Build Your Custom AR-308 Rifle

As firearm enthusiasts and experienced builders at Miami Shooters Supply, we understand the appeal of creating a personalized rifle from the ground up. The Polymer80 LR-308 80% lower receiver provides the foundation for your custom AR-308 build, combining durability, precision engineering, and legal flexibility. Unlike completed receivers, this 80% lower requires final machining, making it ideal for hobbyists who want full control over their firearm’s creation process.

Why Choose the Polymer80 LR-308 Lower Receiver?

Constructed from high-strength polymer reinforced with fiberglass, this lower receiver offers exceptional impact resistance and dimensional stability. It’s designed to withstand the recoil forces of .308 Winchester/7.62x51mm NATO cartridges while maintaining a lightweight profile. The LR-308 pattern ensures compatibility with standard AR-308/AR-10 upper receivers, allowing you to build a rifle tailored to your specific needs—whether for hunting, target shooting, or collection.

Key Features and Benefits

• 80% Complete Design: Requires milling to finish, providing a legal pathway for building your firearm without serialization in most jurisdictions (check local laws).
• High-Strength Polymer Construction: Reinforced with fiberglass for durability and reduced weight compared to aluminum counterparts.
• AR-308/AR-10 Compatibility: Works with standard upper receivers, barrels, and components chambered in .308 Winchester or similar calibers.
• Integrated Jig System Ready: Designed for use with Polymer80’s dedicated jigs (sold separately) to ensure precise milling and drilling.
• Ergonomic Grip and Trigger Guard: Molded-in features enhance comfort and functionality during assembly and use.

Technical Specifications

The Polymer80 LR-308 lower is engineered to meet the specifications of the DPMS LR-308 pattern, ensuring broad compatibility with aftermarket parts. Its polymer composition reduces overall rifle weight without sacrificing strength, making it an excellent choice for hunters and shooters who prioritize portability. The receiver includes pre-molded areas for fire control groups, magazine releases, and buffer tubes, simplifying the build process for those with basic machining skills.

Ideal for DIY Firearm Builders

Whether you’re a first-time builder or an experienced gunsmith, this 80% lower offers a rewarding project. By completing the machining yourself, you gain hands-on experience with firearm mechanics and customization options. At Miami Shooters Supply, we recommend pairing this lower with quality components from our AR-10 parts selection to ensure reliability and performance.

Why Buy From Miami Shooters Supply?

FAQ: Why should I purchase from Miami Shooters Supply? We are a trusted retailer with expertise in firearm components, offering genuine products, competitive pricing, and dedicated customer support. Our team verifies all items for authenticity and provides guidance to ensure you get the right parts for your build.

Important Legal Notice

This 80% lower receiver is sold as a non-firearm component. Buyers are responsible for complying with all federal, state, and local laws regarding firearm manufacturing and ownership. Completion may require tools and skills; consult legal resources before purchase.