.308 80% Lower – Billet

Precision engineering meets modular build flexibility with our .308 80% lower – billet. Machined from a solid block of aircraft-grade 7075-T6 aluminum, this component is designed for the discerning builder who demands tight tolerances and a robust foundation for a large-frame AR platform. Each 80% lower is precisely unfinished to allow the end user to complete the fire control pocket and trigger pin holes, offering a truly personalized build experience without serialization. If you are seeking a .308 80% lower – billet that provides an optimal balance of strength, weight, and customizable finishing, this is the starting point for your next precision or battle rifle project.

Overview

This .308 80% lower – billet is manufactured to Mil-Spec dimensions for compatibility with all DPMS pattern .308 upper receivers and associated parts kits. The billet construction process allows for sharper geometry and tighter corner radii than forged alternatives, resulting in a visually distinct lower with enhanced material integrity. The 80% completion state means the trigger pocket, hammer pin hole, and trigger pin hole are not fully machined, requiring the builder to complete these critical interfaces. This product is intended for hobbyist firearms manufacturers and individuals who wish to create a firearm for personal use in compliance with all applicable federal, state, and local laws. The raw 7075-T6 aluminum is hard coat anodized to MIL-A-8625 Type III for superior wear and corrosion resistance.

Features & Specs

• Material: 7075-T6 Aluminum billet; superior strength-to-weight ratio compared to 6061 variants.
• Finish: Hard coat anodized (MIL-A-8625 Type III) in matte black; provides a non-reflective, abrasion-resistant surface.
• Compatibility: DPMS pattern .308; accepts standard AR-10/SR-25 fire control groups and buffer tubes (specific to large frame).
• Machining Status: 80% complete; requires final milling of trigger pocket and drilling of fire control pin holes. No serial number is present.

• Specifications: Receiver extension threading is 1-3/16 x 16 TPI (standard for DPMS .308). Weight: approximately 12.5 ounces (unfinished).
• Billet Advantages: No forging flash lines; crisp, consistent wall thickness; integral trigger guard (machined as one piece).
• Included: One (1) .308 80% lower – billet receiver with threaded bolt catch pin hole and rear takedown pin detent hole pre-drilled.

• Additional Details: Tensioning screw provision for upper-to-lower fitment adjustment. Magazine catch pocket is fully machined for standard DPMS .308 magazines.
• Hardware: No lower parts kit or jig included; builder must supply appropriate tooling.

Who It’s For

This .308 80% lower – billet is designed for experienced firearm builders who have access to a drill press, mill, or CNC router, and who possess the technical knowledge to complete the fire control pocket to safe and functional specifications. It is ideal for the enthusiast who wants to create a non-serialized lower receiver for a custom precision rifle or a heavy-hitting battle rifle build. This product is not intended for first-time 80% builders unless they have prior machining experience. If you are comfortable with reading engineering drawings and executing precise drilling and milling operations, this lower provides a clean, strong foundation that accepts high-end triggers, match-grade uppers, and adjustable stocks without compromise.

Shipping & FFL

This product is classified as an unfinished firearm receiver (80% lower) and does not meet the definition of a firearm under the Gun Control Act of 1968. As such, it can be shipped directly to your residence or business address without the need for an FFL transfer. No federal background check is required for purchase. However, it is your sole responsibility to ensure that completion of this .308 80% lower – billet into a functional firearm is legal in your state, county, and municipality. Some states and localities impose restrictions on the possession, purchase, or manufacture of unfinished receivers. We strongly recommend consulting with a local attorney or your state attorney general’s office before ordering. By purchasing, you certify that you are not prohibited from possessing firearms under federal or state law and that you will comply with all applicable laws during the manufacturing process. No returns or exchanges are accepted on machined or altered items. Standard shipping rates apply.