.308 80% Lower – Billet

If you’re building a precision AR-10 or LR-308 pattern rifle, the heart of your build starts with the right foundation. That’s where the .308 80% lower – billet comes in. Machined from solid 7075-T6 aluminum, this component gives you the freedom to complete your own firearm without serialization or federal FFL transfer requirements until you finish the machining process. Whether you’re a seasoned hobbyist or a first-time builder, this billet lower offers the rigidity and mass needed for long-range reliability. We’ve sourced these directly from a trusted US machine shop, and every blank is inspected for dimensional accuracy before it hits our shelves.

Overview

The .308 80% lower – billet is designed for builders who want a heavier, stiffer platform than forged lowers can provide. The billet construction starts as a solid block of aluminum, then gets machined into a near-net shape so you can finish the fire control pocket and trigger pin holes at home. This specific blank is compatible with DPMS Gen 1 pattern upper receivers, which covers the vast majority of aftermarket handguards, barrels, and bolt carrier groups. Because it’s an 80% lower, you won’t need to involve an FFL for the initial purchase—just ship it straight to your door. The pocket is pre-machined to within 80% of completion, leaving you the final 20% to finish with a jig and router or drill press. It’s a straightforward weekend project if you have basic tools and patience.

Features & Specs

This .308 80% lower – billet is built around real-world use. We’ve handled enough AR-10 lowers to know that sloppy tolerances ruin accuracy, so this one is held to tight .001-inch specs across critical interfaces. The billet construction also eliminates the mold lines and potential stress points you sometimes see in forged lowers.

• Material: 7075-T6 aluminum billet, hard coat anodized in black for corrosion resistance
• Compatibility: DPMS Gen 1 LR-308 pattern (fits most standard AR-10 uppers with the slant-cut rear)
• Pocket depth: Pre-machined to 80% completion, includes integral trigger guard

• Weight: Approximately 12.5 ounces (heavier than forged, reducing felt recoil)
• Finish: Mil-spec type III hard coat anodizing per MIL-A-8625F
• Markings: Minimal logo on left side, no serial number or caliber markings

• Threaded bolt catch pin hole: Standard .154-inch diameter for ambidextrous catch compatibility
• Safety selector holes: Pre-drilled and reamed to .250-inch for crisp detent engagement
• Grip screw: 1/4-28 thread, standard for AR-style grips

Who It’s For

This .308 80% lower – billet is for the DIY builder who wants a dedicated long-range hunting rifle or a target gun that won’t flex under heavy loads. If you’re assembling a precision gas gun in .308 Winchester, 6.5 Creedmoor, or even a wildcat cartridge, the extra stiffness of billet helps maintain consistent bedding with your upper. It’s also ideal for someone who prefers to avoid the paperwork and background check that comes with buying a complete serialized receiver. Just know that you’ll need a finishing jig, a router or end mill, and the willingness to learn a new skill. We’re happy to point you toward reputable jig kits if you’re unsure where to start.

Shipping & FFL

Because this is an 80% lower receiver, it is not considered a firearm under federal law (as defined by the GCA of 1968). It can be shipped directly to your home or business address with no FFL transfer required. We ship via UPS Ground with adult signature required for security. Please check your state and local laws before ordering—some states regulate 80% lowers as firearms or require serialization. By purchasing, you confirm that you are legally allowed to possess and complete this component in your jurisdiction. We do not provide finishing services or legal advice; you are responsible for compliance with all applicable laws.