.308 80% Lower – Billet

The .308 80% lower – billet is a precision-machined foundation for builders who demand a larger-frame platform without the regulatory hurdles of a serialized receiver. This component is crafted from solid billet aluminum, providing enhanced material density and structural integrity compared to forged alternatives. Designed for the AR-308 pattern, it accepts standard DPMS-pattern parts kits and offers the builder full control over the final assembly. Whether you are constructing a long-range precision rifle or a heavy-hitting hunting setup, this lower serves as the core of your project.

Overview

This .308 80% lower – billet is manufactured from 7075-T6 aluminum, a grade known for its superior strength-to-weight ratio. The billet machining process removes excess material from a solid block, resulting in tighter tolerances and a cleaner grain structure. The lower is left in an unfinished state, requiring the end user to complete the fire control pocket and trigger pin holes. It is compatible with DPMS-style upper receivers and magazines, ensuring broad parts availability. The raw finish allows for custom cerakote, anodizing, or other coatings to match your build aesthetic.

Features & Specs

• Material: 7075-T6 billet aluminum with hard coat anodized finish (exterior only; interior remains unfinished for completion)
• Compatibility: DPMS low-profile pattern; accepts standard AR-308 lower parts kits and buffer tubes
• Machining: CNC-machined from solid billet with reinforced front pivot pin lugs and rear takedown boss

Key specifications include a mil-spec trigger pocket depth of 1.250 inches, integrated trigger guard, and compatibility with both A2 and pistol grip configurations. The lower features a flared magazine well for rapid reloads and is designed to accept standard AR-308 magazines. All critical dimensions are held to +/- 0.002 inches for reliable fitment with premium upper receivers.

Who It’s For

This .308 80% lower – billet is intended for experienced builders who possess the necessary tooling and knowledge to complete a firearm receiver. It is not for first-time hobbyists or those unfamiliar with jig setups and end mill operations. The ideal user is someone who values a matched billet set, wants to avoid a serialized lower in their build, or prefers to customize the fire control geometry. This component is suitable for precision rifle projects, SPR-style builds, or heavy-caliber hunting rifles where receiver strength is critical.

• Experienced DIY gunsmiths with access to a drill press or CNC router
• Builders seeking a DPMS-pattern .308 platform with billet tolerances
• Shooters who prefer a non-serialized receiver for personal builds

Shipping & FFL

This .308 80% lower – billet is not a firearm and may be shipped directly to your residence without an FFL transfer. No serial number is required by federal regulation, though you must comply with all applicable state and local laws regarding 80% receivers. Some states and municipalities impose restrictions on the purchase or possession of unfinished receivers. It is your responsibility to verify legality in your jurisdiction before ordering. We ship via UPS Ground with adult signature required. No returns or exchanges on machined components.

• No FFL required for shipment to most states
• Check local laws regarding 80% receiver ownership
• Adult signature required at delivery

This .308 80% lower – billet gives you the foundation to build a custom rifle on your terms. All specifications are tested to industry standards for dimensional accuracy and material hardness.