Polymer80 LR-308 80% Lower Receiver

The Polymer80 LR-308 80% lower receiver represents a precision-engineered foundation for builders seeking a custom large-frame AR platform. Designed for the .308 Winchester / 7.62 NATO cartridge family, this 80% lower receiver requires final machining to complete the fire control cavity and trigger pin holes. As an 80% component, it is not a firearm and may be shipped directly to your residence. The polymer construction offers a significant reduction in overall weight compared to traditional aluminum billet receivers, while maintaining the dimensional stability required for reliable long-range performance. This polymer80 lr-308 80% lower receiver is compatible with DPMS pattern LR-308 upper receivers and parts kits, providing broad aftermarket support.

Overview

The Polymer80 LR-308 80% lower receiver is manufactured from high-impact polymer reinforced with internal metal inserts at critical stress points, including the buffer tower and trigger pin recesses. This design mitigates common failure points found in standard polymer lowers while maintaining the low weight profile that polymer enthusiasts seek. The receiver is molded to 80% completion, meaning the trigger pocket and selector detent channel are not fully machined. The user must complete these cavities using a drill press, router, or jig system. The polymer material allows for a faster machining process than aluminum, reducing build time for experienced hobbyists. This polymer80 lr-308 80% lower receiver adheres to DPMS LR-308 specifications, ensuring compatibility with a wide range of barrels, handguards, and bolt carrier groups designed for the AR-10 platform.

Features & Specs

This lower receiver offers a combination of material science and design engineering suited for competition, hunting, and recreational shooting. The polymer formulation provides resistance to impact and solvent exposure while remaining lightweight. The integrated trigger guard is molded as a single unit with the receiver body, eliminating a separate assembly step. The receiver accepts all standard AR-10 / LR-308 lower parts kits and buffer tube assemblies.

• Material: High-impact polymer with stainless steel trigger pin inserts and reinforced buffer tower
• Platform: DPMS pattern LR-308 / AR-10 compatible (308 Winchester / 7.62 NATO)
• Completion level: 80% – requires final machining of trigger pocket, hammer pin hole, and trigger pin hole
• Finish: Textured black polymer with molded-in grip texture panels
• Weight: 8.4 ounces (unmachined)

• Compatible with standard LR-308 lower parts kits, pistol grips, and collapsible or fixed stocks
• Accepts standard AR-10 buffer tubes and buffer weights (carbine or rifle length)
• Integrated trigger guard with clearance for gloved fingers

• Requires use of a Polymer80 LR-308 jig or equivalent jig system for proper cavity alignment
• Recommended machining tools: drill press with 2-axis vise, hand router, or CNC mill
• Finished cavity depth: 1.250 inches from top of receiver

Who It’s For

The Polymer80 LR-308 80% lower receiver is intended for the experienced DIY builder who possesses the tools and knowledge to complete an 80% lower receiver to a functional state. This product is suitable for shooters who want a lightweight, cost-effective alternative to aluminum receivers for their .308 build. It is particularly well-suited for those who prioritize weight savings for hunting or field shooting, as the polymer construction reduces overall rifle weight by approximately 6-8 ounces compared to a standard billet aluminum lower. This product is not recommended for first-time builders unless they have prior experience with 80% jigs and polymer machining. The polymer80 lr-308 80% lower receiver is designed for lawful firearm construction by individuals who are not prohibited from possessing firearms under federal or state law.

Shipping & FFL

Because this item is an 80% lower receiver and is not classified as a firearm under the Gun Control Act of 1968 (GCA), it may be shipped directly to your residence or business address without the need for a Federal Firearms License (FFL) transfer. No background check is required at the point of purchase. However, it is your responsibility to verify that possession and completion of an 80% lower receiver is legal in your state, county, and municipality. Some states, including but not limited to California, New York, New Jersey, Connecticut, Massachusetts, Maryland, Washington, Delaware, Hawaii, Rhode Island, and the District of Columbia, restrict, regulate, or prohibit the sale, possession, or completion of 80% lower receivers. By purchasing this product, you acknowledge that you are compliant with all applicable local, state, and federal laws. This product is sold as a raw component for educational, hobbyist, and gunsmithing purposes. We recommend consulting with a legal professional or your local law enforcement agency regarding the legal status of 80% receivers in your jurisdiction before placing an order.