.308 80% Lower – Billet

The .308 80% lower – billet is a precision-machined foundation for building a reliable large-frame rifle. Designed for shooters who value accuracy and durability, this component gives you complete control over your build while adhering to ATF guidelines for non-firearm receivers. Made from solid billet aluminum, it offers the strength needed for .308 caliber pressure cycles without the porosity found in cast alternatives.

Overview

This .308 80% lower – billet starts as a solid block of 7075-T6 aluminum, CNC machined to exacting tolerances. It is an unfinished receiver that requires final milling to accept fire control groups and trigger components. The billet construction eliminates weak points common in forged lowers, providing a straighter, more consistent platform for precision builds. Compatible with DPMS-style upper receivers, it serves as the core of a custom .308 rifle or pistol build.

Features & Specs

• Material: 7075-T6 billet aluminum with hard coat anodized finish for corrosion resistance and dimensional stability
• Compatibility: DPMS Gen 1 pattern; accepts standard AR-10 parts kits, buffer tubes, and buttstocks
• Machining: Full CNC billet cut with integrated trigger guard, flared magazine well, and rear lug reinforcement

Every .308 80% lower – billet is inspected for thread alignment, pocket depth, and rail interface before shipment. The lower receiver extension threads are cut to mil-spec tolerances to ensure proper stock and buffer tube fitment. All critical surfaces are deburred and chamfered for safe handling during the finishing process.

Key Specifications

• Manufacturer: .308
• Category: Parts
• Finish: Type III hard coat anodized, black
• Weight: 12.4 ounces (unfinished)
• Width: 0.870 inches at rear takedown pin lug

Who It Is For

The .308 80% lower – billet is intended for competent builders with access to a drill press, milling machine, or jig system. It suits experienced hobbyists who want to assemble a large-frame rifle from the ground up, selecting each component for accuracy and reliability. This product is not for first-time builders unless they have prior experience with 80% finishing. It is also ideal for those maintaining a personal inventory of non-serialized receivers for future builds, provided local and state laws permit possession.

Shipping & FFL

This .308 80% lower – billet is not a firearm and does not require transfer through a Federal Firearms License (FFL) holder when shipped. It is classified as an unfinished receiver component under current ATF rulings. However, federal law prohibits the manufacture of a firearm for sale or distribution without a license. You are responsible for understanding and complying with all applicable local, state, and federal laws regarding the possession and finishing of 80% lower receivers. This product cannot be shipped to addresses in California, Connecticut, Delaware, Hawaii, Illinois, Maryland, Massachusetts, New Jersey, New York, Rhode Island, Vermont, or Washington, D.C., without additional verification of compliance with state law. By purchasing, you confirm that you are legally permitted to own and finish this component in your jurisdiction.