.308 80% Lower – Billet

When building a precision long-range rifle or a durable battle platform, the foundation matters. The .308 80% lower – billet is machined from solid 7075-T6 aluminum, offering the strength and rigidity required for high-pressure .308 / 7.62 NATO builds. Every unit is a clean, unregistered blank, giving you the freedom to complete your firearm in compliance with federal regulations. This lower is designed for builders who demand tight tolerances and a robust platform.

Overview

The .308 80% lower – billet is a direct replacement for standard AR-10 / LR-308 pattern receivers. Manufactured from a single billet block, it eliminates the structural weaknesses found in forged receivers. The pocket is precisely pre-machined to 80% completion, requiring only final milling to accept a standard parts kit. With a Type III hard coat anodized finish, this lower resists corrosion, wear, and solvents. It is compatible with DPMS pattern uppers, giving you maximum flexibility for barrel, handguard, and stock choices.

Features & Specs

• Material: 7075-T6 aluminum billet, heat-treated for maximum tensile strength
• Finish: MIL-SPEC Type III Class 2 hard coat anodized, black
• Compatibility: DPMS Gen 1 high-profile and low-profile uppers
• Integral trigger guard machined from the same billet for zero flex
• Pre-drilled and tapped for set screw rear takedown pin adjustment

Each .308 80% lower – billet is individually inspected for thread alignment and pocket depth. The magazine well is beveled for smooth reloads, and the bolt catch recess is fully machined. Specs include a standard 0.250-inch trigger pin diameter and a 0.154-inch hammer pin diameter. The lower accepts all standard AR-10 lower parts kits, stocks, and grips.

• Weight: 12.1 ounces (bare receiver)
• Threads: 4-40 for grip screw, 1/4-28 for buffer tube
• Caliber: .308 Winchester / 7.62x51mm NATO

Who It’s For

This .308 80% lower – billet is for the experienced home builder who understands the mechanical requirements of a full-power cartridge. It is designed for shooters who prioritize accuracy over budget. The billet construction reduces vibration and flex, which is critical for sub-MOA builds. It is not a starter project; you should have prior experience with 80% lowers and access to a drill press or CNC mill. This lower is ideal for hunters, precision shooters, and competition shooters who want a custom rifle without paying a premium for a completed receiver.

• Requires final machining of the fire control pocket and safety selector hole
• Does not include jig, trigger, or lower parts kit
• Must be completed into a functional firearm before assembly

Shipping & FFL

This .308 80% lower – billet is not a firearm and does not require transfer through a Federal Firearms License (FFL) holder. It may be shipped directly to your residence in most states. However, you are solely responsible for understanding and complying with all local, state, and federal laws regarding the possession and completion of an 80% lower. Some states and municipalities restrict or prohibit the ownership of unfinished receivers. We recommend verifying your local laws before ordering. No FFL is required for purchase, but no liability is assumed for legal non-compliance on the part of the buyer. By purchasing, you certify that you are legally allowed to own this product.