Description

Polymer80 80% Lower Receiver And Jig Kit (Lr-308)

If you are looking to build a large-frame AR-style firearm from the ground up, the Polymer80 80% Lower Receiver and Jig Kit (LR-308) is a solid starting point. This kit gives you the core components needed to complete an unfinished lower receiver at home, without the need for a full machine shop. Polymer80 is known for its practical, user-focused build kits, and this LR-308 version is no exception. It is designed for builders who want a hands-on project and a reliable foundation for their .308 or 6.5 Creedmoor builds.

Overview

This kit includes an unfinished 80% lower receiver specifically molded for the LR-308 platform, along with the necessary jig and tooling to finish the fire control pocket and trigger pin holes. The polymer80 80% lower receiver and jig kit (lr-308) is engineered to be compatible with DPMS-pattern large-frame AR parts, giving you a wide range of upper receiver and barrel options. The receiver itself is made from a high-impact, glass-reinforced polymer that holds up well under recoil and resists cracking. The included jig is reusable, so if you plan to build multiple lowers, you can buy additional raw receivers separately.

Features & Specs

The kit is built around a few key functional features that make the build process straightforward. The jig is CNC-machined from billet aluminum, which keeps the drill bit aligned and prevents wandering. The lower receiver has a reinforced buffer tube tower and a metal trigger guard insert for added durability. Here is a quick look at what you get in the box:

• One Polymer80 LR-308 80% lower receiver (unfinished, no serial number)
• One complete jig kit with drill bits, end mill, and alignment pins
• Reusable aluminum jig body with stainless steel guide bushings

From a spec standpoint, the receiver accepts standard LR-308 lower parts kits and uses a standard AR-10 buffer tube. The grip angle is similar to a standard AR-15, so ergonomics feel familiar. The polymer material is lightweight, coming in at roughly 20% less weight than an equivalent aluminum lower. This can be a real advantage if you are building a hunting or long-range pack rifle.

• Material: Glass-reinforced polymer with metal inserts
• Platform: DPMS pattern LR-308 / AR-10
• Finish: Textured black, ready for finishing

Who It’s For

This kit is for the home builder who wants to complete a firearm without a serial number, for personal use. It is not a drop-in part; you will need basic tools like a drill press or a hand drill with a steady hand. The polymer80 80% lower receiver and jig kit (lr-308) is best suited for someone who has already built a standard AR-15 lower and is ready to step up to a large-frame caliber. It is also a good choice for shooters who want a dedicated lower for a .308 build without paying for a fully finished, serialized receiver. If you are new to 80% builds, take your time reading the included instructions and watch a few online walkthroughs before starting.

• Home builders with intermediate mechanical skills
• Shooters building a lightweight .308 or 6.5 Creedmoor rifle
• Anyone who prefers to assemble their own firearm without a serial number

Shipping & FFL

Because this is an 80% lower receiver, it is not classified as a firearm by the ATF. It can be shipped directly to your home address with no FFL transfer required. There is no background check, and no waiting period. However, once you complete the receiver by machining the fire control pocket, it becomes a firearm under federal law. You must check your state and local laws before purchasing, as some jurisdictions restrict or prohibit 80% lowers. No FFL transfer is needed for this polymer80 80% lower receiver and jig kit (lr-308). Shipment is via UPS or FedEx with adult signature required.