Polymer80 LR-308 80% Lower Receiver

If you are looking to build a custom .308 or 6.5 Creedmoor rifle from the ground up, the Polymer80 LR-308 80% lower receiver is one of the most practical starting points on the market. This receiver gives you the freedom to complete your build at home, without the need for a serialized transfer through a dealer. Made from the same high-impact polymer used in Polymer80’s popular pistol frames, this lower is built for durability and straightforward finishing work. Whether you are a first-time builder or a seasoned hobbyist, this receiver offers a solid foundation for a large-frame AR platform.

Overview

The Polymer80 LR-308 80% lower receiver is designed to accept standard LR-308 and DPMS pattern parts kits, making it compatible with a wide range of aftermarket components. It starts as an unfinished block of reinforced polymer, meaning you will need to complete the fire control pocket, trigger pin holes, and buffer tube threads using basic tools and a drill press or hand router. The result is a fully functional, unserialized lower receiver that you can finish on your own schedule. For anyone looking to avoid the paperwork and wait times of a traditional FFL purchase, this receiver is a straightforward solution.

Features & Specs

This receiver is built around practical, no-nonsense engineering. The polymer construction reduces overall weight compared to aluminum alternatives, while the reinforced stress points handle the recoil of larger calibers without issue. Below are the key specifications and features you can expect.

• Manufacturer: Polymer80
• Category: Parts
• Material: Impact-resistant polymer with reinforced trigger housing and buffer tower
• Compatibility: Works with standard LR-308 and DPMS pattern lower parts kits, upper receivers, and buffer tubes

The finish process is straightforward. The jig and tooling required are available separately, and the receiver includes clear indexing marks to guide your drilling and routing. You will not need a milling machine or advanced machining skills to complete this lower. Just take your time, follow the included instructions, and you will have a functional receiver ready for assembly.

• Pre-drilled pilot holes for trigger and hammer pin locations
• Integrated trigger guard for a clean, one-piece look
• Textured grip area for positive control during use

• Accepts standard AR-308 fire control groups and grips
• Receiver extension (buffer tube) threads are pre-formed, requiring only final tapping
• Fits most aftermarket LR-308 upper receivers without modification

Who It’s For

This lower receiver is ideal for the home builder who wants a large-frame rifle without dealing with a serialized receiver. It suits anyone comfortable with basic shop tools and a weekend project. Whether you are assembling a long-range precision rifle or a lightweight hunting build, the Polymer80 LR-308 80% lower receiver gives you the flexibility to choose every component yourself. It is also a good option for those who want to build multiple rifles over time, since each receiver is sold individually and does not require a background check to purchase. Just keep in mind that you are responsible for completing the receiver in compliance with federal law, and the finished product must not be transferred to anyone prohibited from possessing firearms.

Shipping & FFL

Because this is an 80% lower receiver and not a finished firearm, it ships directly to your door without the need for an FFL transfer. There is no background check required at the time of purchase, and no paperwork for a dealer to process. However, once you complete the receiver, it becomes a firearm under federal law. You may not sell or transfer it to someone who is prohibited from owning firearms. Check your state and local laws before ordering, as some jurisdictions have restrictions on unserialized receivers. We ship within the continental US to residential and business addresses. No signature is required unless requested at checkout. If you have questions about legality in your area, contact your local law enforcement or firearms attorney before beginning your build.