Description

Polymer80 LR-308 80% Lower Receiver

Overview

The Polymer80 LR-308 80% Lower Receiver represents a precision-engineered foundation for builders seeking a lightweight, durable platform for large-frame AR-style builds. Manufactured by Polymer80, this component is designed for the LR-308 pattern, accommodating DPMS-style high-profile and low-profile upper receivers. As an 80% lower receiver, it requires final machining of the fire control group pocket, trigger pin holes, and selector lever detent channel before assembly. This receiver is constructed from reinforced polymer with integral stainless steel trigger pin inserts, providing dimensional stability and resistance to wear under sustained use. The Polymer80 LR-308 80% Lower Receiver is a non-serialized component intended for hobbyist fabrication in compliance with all applicable federal and state laws.

Features & Specs

This receiver is built to exacting tolerances, ensuring compatibility with standard LR-308 parts kits and buffer tube assemblies. The reinforced polymer construction reduces overall weight compared to aluminum alternatives while maintaining structural integrity. Below are the key specifications and design details.

• Manufacturer: Polymer80
• Category: Parts
• Material: High-impact reinforced polymer with stainless steel trigger pin inserts
• Platform Compatibility: LR-308 / DPMS pattern (high-profile and low-profile upper receivers)
• Finish: Textured black, non-reflective surface

Machining Requirements

The Polymer80 LR-308 80% Lower Receiver requires completion of the following operations using a drill press, router, or jig system:

• Trigger pocket milling to specified depth and width
• Fire control group pin holes (0.156 inch diameter)
• Selector lever detent channel
• Hammer and trigger pin alignment for safe function

Compatible Components

This lower receiver is designed for use with standard LR-308 lower parts kits, AR-308 buffer tubes, and DPMS-style magazines. It does not accept AR-15 components due to dimensional differences in the fire control group pocket.

• Accepts DPMS-pattern LR-308 lower parts kits
• Compatible with AR-308 carbine and rifle buffer tubes
• Uses standard DPMS-pattern magazines (20-round and 25-round)

Who It Is For

The Polymer80 LR-308 80% Lower Receiver is intended for experienced firearm builders who possess the necessary tools, skills, and knowledge to complete the machining process safely and accurately. This product is suited for individuals who want to construct a custom large-frame rifle from the ground up, selecting their own trigger group, stock, and upper receiver assembly. It is not recommended for first-time builders or those unfamiliar with 80% receiver finishing procedures. Builders must verify their local, state, and federal legal status regarding the possession and completion of unserialized firearm components before purchasing. This product is for hobbyist fabrication and is not a finished firearm component ready for use.

Shipping & FFL

This Polymer80 LR-308 80% Lower Receiver is classified as a non-firearm component under federal law and does not require transfer through a Federal Firearms License (FFL) dealer at the time of purchase. However, once machined into a functional lower receiver, it becomes a firearm and must comply with all applicable laws, including serialization requirements in certain states. Shipped directly to your residence within the contiguous United States where local laws permit. No FFL transfer is required for this unfinished receiver. Builders are solely responsible for verifying that completion and possession of an unserialized firearm is legal in their jurisdiction. We do not ship to California, New York, New Jersey, Connecticut, Massachusetts, Washington D.C., or any other jurisdiction where 80% receivers are restricted. By purchasing this product, you affirm that you are legally eligible to possess and complete a firearm in your state of residence.