Description

Polymer80 LR-308 80% Lower Receiver

The Polymer80 LR-308 80% lower receiver represents a critical starting point for the custom large-frame AR platform. Designed for the builder who requires precision engineering without the serialized paperwork, this component is manufactured from a proprietary reinforced polymer blend that balances weight reduction with structural integrity. As an unfinished receiver, it requires final machining of the trigger pocket, fire control group holes, and buffer tube threads, allowing the end user to complete a firearm that meets their exact specifications. This receiver is compatible with DPMS-pattern LR-308 components, providing a standardized build platform for .308 Winchester and 6.5 Creedmoor cartridges.

Overview

The Polymer80 LR-308 80% lower receiver is a precision-machined polymer blank that has been formed to 80% completion, leaving the critical fire control group areas undrilled. Constructed from a high-impact, glass-reinforced nylon polymer, this receiver offers significant weight savings over standard aluminum lowers while maintaining dimensional stability through the build process. The receiver is designed to accept standard LR-308 lower parts kits, buffer tubes, and pistol grip configurations, ensuring compatibility with the vast aftermarket ecosystem. For builders seeking a lightweight large-frame platform, this polymer80 lr-308 80% lower receiver provides the foundation for a custom hunting, competition, or long-range precision rifle without the need for a federal firearms license transfer at the point of purchase.

Features & Specs

This receiver is manufactured to exacting tolerances that ensure proper alignment with DPMS-spec uppers and lower parts. The polymer material is engineered to resist chemical exposure from cleaning solvents and lubricants while maintaining its structural properties across a wide temperature range. The receiver features integral trigger guard, reinforced buffer tower, and pre-molded grip tang for streamlined finishing.

• Material: Proprietary glass-reinforced Nylon 6/6 polymer composite; impact-resistant and dimensionally stable
• Compatibility: DPMS-pattern LR-308 large-frame components; accepts standard AR-308 lower parts kits and buffer tubes
• Machining requirements: Requires drilling of trigger pin holes, hammer pin holes, and safety selector hole; trigger pocket must be milled to depth

Additional specifications include a MIL-spec buffer tube thread pattern (1.187-inch diameter, 16 TPI) and compatibility with standard AR-308 pistol grips. The receiver weighs approximately 7.2 ounces, representing a weight reduction of roughly 40% compared to aluminum equivalents. The polymer80 lr-308 80% lower receiver is packaged with a drill guide template to assist in proper hole placement during finishing.

• Finish: Textured black polymer surface for secure grip and reduced glare
• Thread specification: 1/2-28 for rear takedown pin detent; 0.125-inch trigger pin diameter
• Includes: Lower receiver blank, drill guide template, instructional documentation

Who It’s For

This product is intended for experienced firearms builders who possess the necessary machining equipment and technical knowledge to complete an 80% lower receiver. It is suited for individuals constructing a lightweight large-frame rifle for long-range target shooting, hunting in rugged terrain, or competition use where weight reduction is a priority. The polymer construction makes it particularly attractive for backcountry hunters who carry their rifle over extended distances. This component is not recommended for first-time builders due to the precision machining required for proper fire control group function. The polymer80 lr-308 80% lower receiver is also appropriate for hobbyists who enjoy the engineering challenge of completing a firearm from a partially machined blank.

Shipping & FFL

This item does not require shipment to a Federal Firearms License (FFL) dealer as it is not classified as a firearm under federal law when sold as an 80% lower receiver. However, the purchaser must comply with all applicable federal, state, and local laws regarding the possession and completion of unfinished receivers. It is the responsibility of the buyer to verify that ownership and finishing of an 80% lower receiver is legal in their jurisdiction. Some states and municipalities have enacted restrictions on 80% receivers; check your local regulations before ordering. This product ships via ground service and may require adult signature upon delivery. Once the receiver is completed into a functional firearm, it must be marked in accordance with federal regulations if manufactured for personal use and subsequently transferred.

• No FFL transfer required for this unfinished receiver
• Buyer must verify local legal compliance before purchase
• Adult signature required upon delivery