Description

.308 80% Lower – Billet: Precision Platform for Custom Builds

For builders seeking a robust foundation for a large-frame AR platform, the .308 80% lower – billet offers an unmatched combination of material density and dimensional accuracy. Machined from a solid block of 7075-T6 aluminum, this component is designed to accept standard DPMS-pattern parts kits while providing the end user with the satisfaction of completing a firearm from the ground up. Whether you are assembling a precision long-range rifle or a rugged hunting setup, this billet lower serves as the critical structural core of your build.

Overview

The .308 80% lower – billet is a pre-machined receiver that requires final milling of the trigger pocket, fire control group recess, and safety selector holes to become a functional firearm receiver. Manufactured from 7075-T6 aluminum, it exceeds military-grade hardness standards while maintaining a lightweight profile. The billet construction process—cut from a single block rather than forged—eliminates internal stress points and delivers sharper, more defined geometry than cast alternatives. This lower is designed to interface seamlessly with DPMS-pattern uppers and components, ensuring reliability across a wide range of aftermarket parts. The hardcoat anodized finish (Type III, Class 2) provides exceptional corrosion resistance and a non-reflective matte surface suitable for field use.

Features & Specs

Every .308 80% lower – billet is manufactured to strict dimensional tolerances, with critical pocket areas left precisely 0.125 inches from final depth to comply with ATF guidelines. The receiver is compatible with standard AR-308 buffer tubes, pistol grips, and buttstocks. Below are the primary specifications and design highlights.

• Material: 7075-T6 aluminum billet, heat-treated to T6 condition for maximum tensile strength (83,000 PSI yield)
• Finish: MIL-SPEC Type III Class 2 hardcoat anodizing, matte black, 0.002-inch minimum thickness
• Compatibility: DPMS-pattern high/low tang uppers, standard AR-308 fire control group and buffer system

Additional design features include an integrated trigger guard (no separate installation required), a flared magazine well for faster reloads, and a rear takedown pin detent pocket that accepts both standard and captive spring configurations. The receiver is pre-drilled for bolt catch, magazine catch, and selector detent assemblies, reducing the complexity of final assembly.

• Pocket dimensions: 1.250 inches wide, 2.750 inches deep (pre-milled to 80% completion)
• Thread pitch: 1/2-28 for buffer tube (standard AR-308 configuration)
• Weight: 11.2 ounces (unfinished, with no small parts installed)

Who It’s For

This .308 80% lower – billet is intended for experienced hobbyists who possess a functional milling machine or CNC setup and understand the legal requirements of completing a firearm receiver. It is suitable for DIY builders who want full control over trigger selection, stock configuration, and overall rifle ergonomics. The billet platform particularly appeals to shooters building a precision gas gun for competition, long-range target shooting, or medium-to-large game hunting where .308 Winchester or 6.5 Creedmoor chamberings are preferred. It is not designed for first-time builders without access to proper tooling or for those seeking a drop-in component without machining steps.

Shipping & FFL

This .308 80% lower – billet is classified as a non-firearm receiver blank under federal law and does not require transfer through a Federal Firearms License (FFL) holder. It ships directly to your residential or commercial address with no background check required. However, once machining is completed to create a functional receiver, the finished product becomes a firearm and must comply with all applicable state and federal laws, including serialization requirements in certain jurisdictions. You are solely responsible for verifying that completion and possession of this component are legal in your state, county, and municipality. No returns are accepted on machined or altered receivers. Standard shipping rates apply; expedited options are available at checkout.

Important Disclaimer: This product is sold as an unfinished receiver blank. The buyer assumes all responsibility for compliance with local, state, and federal laws regarding the completion and ownership of firearms. We do not provide legal advice. Consult an attorney if you have questions about your specific legal obligations.