Description

.308 80% Lower – Billet

The .308 80% lower – billet is the foundation for a custom large-frame build that delivers performance and reliability. Machined from solid 7075-T6 aluminum, this component offers the strength required for high-pressure .308 Winchester and 6.5 Creedmoor chamberings. As an unfinished lower receiver, it requires final machining and assembly, giving you full control over your firearm’s specifications without serialization requirements.

Overview

This .308 80% lower – billet is precision-machined to accept standard AR-10/SR-25 pattern parts. The billet construction process starts with a solid block of aircraft-grade aluminum, which is then cut to near-final dimensions. Unlike forged receivers, this billet design provides sharper detail, tighter tolerances, and a smoother external finish. The 80% completion state means the fire control pocket and trigger pin holes are left partially unfinished, requiring the end user to complete the final machining steps.

Features & Specs

• Material: 7075-T6 aluminum billet, Type III Class 2 hard coat anodized for corrosion and wear resistance
• Compatibility: Accepts DPMS pattern .308 upper receivers, buffer tubes, and lower parts kits
• Pocket depth: 80% completion with indexed jig locator holes for precision finishing

Key design elements include a reinforced front pivot pin boss, integral trigger guard, and a flared magazine well for faster reloads. The .308 80% lower – billet weighs approximately 10.5 ounces before finishing. All critical dimensions meet or exceed mil-spec tolerance ranges for AR-10 platform components. The anodized finish is non-reflective and resists solvents and lubricants used in regular maintenance.

• Threaded bolt catch pin hole (4-40) for easy installation without staking
• Oversized trigger guard accommodates gloved hands
• Rear takedown pin detent channel pre-drilled and tapped

Who It’s For

This .308 80% lower – billet is designed for builders who want a large-frame AR platform without a serialized component. It suits experienced hobbyists with access to a drill press, router, or CNC machine who understand the legal requirements for manufacturing a firearm for personal use. The billet construction appeals to those who prioritize dimensional accuracy over cost savings. It is not recommended for first-time builders unfamiliar with 80% finishing procedures, as the .308 pattern has less standardization than AR-15 lowers.

You must verify that your intended upper receiver and lower parts kit are DPMS pattern compatible before beginning your build. This lower is not compatible with ArmaLite AR-10 pattern components without modifications.

• Intermediate and experienced builders with finishing tools
• Shooters building precision long-range rifles in .308 or 6.5 Creedmoor
• Those who prefer billet aesthetics and tighter tolerances over forged receivers

Shipping & FFL

This .308 80% lower – billet ships directly to your residence or business address. No Federal Firearms License (FFL) transfer is required for this unfinished receiver because it is not classified as a firearm under federal law until it is machined to a functional state. However, you are solely responsible for complying with all federal, state, and local laws regarding the manufacture and possession of firearms. Some states and municipalities restrict or prohibit 80% lowers. Check your local regulations before ordering. By purchasing this product, you confirm that you are legally eligible to possess a firearm and that you will complete the finishing process in compliance with applicable laws. We do not provide legal advice. If you have questions about your jurisdiction’s requirements, consult a qualified attorney.