Polymer80 LR-308 80% Lower Receiver

Overview

The Polymer80 LR-308 80% lower receiver represents a precise engineering solution for builders focused on large-frame AR platforms. This component is designed for the .308 Winchester/7.62 NATO pattern, offering a lightweight polymer construction that reduces overall rifle weight without compromising structural integrity. As an 80% receiver, this unit requires final machining of the fire control pocket and trigger pin holes before it can be assembled into a functional firearm. The polymer80 lr-308 80% lower receiver is compatible with standard DPMS-pattern upper receivers and parts kits, providing a solid foundation for custom long-range or hunting builds. Each receiver is manufactured from high-impact, glass-reinforced polymer to meet the demanding specifications of the AR-308 platform.

Features & Specs

This polymer80 lr-308 80% lower receiver is crafted from proprietary Nylon 6/6 polymer with 15% glass fill, offering a balance of weight savings and dimensional stability. The receiver features an integrated trigger guard, flared magazine well for rapid reloads, and a rear takedown pin detent channel that is pre-drilled and tapped. All critical jig-indexing points are clearly marked for the drilling and milling process. The unit is designed to accept standard AR-308 fire control groups and buffer tube assemblies.

• Material: Glass-reinforced Nylon 6/6 polymer with UV stabilizers
• Platform Compatibility: DPMS-pattern LR-308 / AR-308 large frame
• Configuration: 80% complete; requires machining of fire control pocket, trigger pin holes, and selector detent
• Weight: 0.46 pounds (unmachined), offering significant weight reduction compared to aluminum receivers

• Integrated trigger guard with reinforced bridge
• Flared magazine well for improved reload efficiency
• Pre-drilled rear takedown pin detent channel and spring hole
• Accept standard AR-308 pistol grip and buffer tube threads

• Manufacturer: Polymer80
• Category: Parts
• Finish: Black textured
• Includes: Lower receiver only; no jig, bits, or parts kit included

Who It’s For

The polymer80 lr-308 80% lower receiver is intended for experienced firearm builders who possess the necessary tools and machining skills to complete an 80% lower. This product is suited for individuals constructing a lightweight hunting rifle, a precision long-range platform, or a general-purpose large-caliber build. Builders should have prior experience with AR-308 assembly and access to a drill press, router, or appropriate jig system. This component is not recommended for first-time builders due to the tighter tolerances and specific machining requirements of the large-frame platform. It appeals to those who prefer the reduced weight of polymer over aluminum for field use or who seek to customize the trigger, stock, and grip from the ground up.

Shipping & FFL

This polymer80 lr-308 80% lower receiver is classified as a non-firearm item under federal regulations because it is not yet a functional firearm. Therefore, it ships directly to your doorstep without the need for a Federal Firearms License (FFL) transfer. No background check is required for purchase or shipment. However, you must be at least 21 years of age to purchase this product. Some state and local jurisdictions may impose restrictions on the possession or completion of 80% receivers. It is your responsibility to verify that ownership and completion of this product complies with all applicable federal, state, and local laws. By purchasing this item, you certify that you are legally eligible to possess a firearm and that you will complete the receiver in compliance with all regulations. No FFL transfer fee applies to this shipment.