Premium Fire/Safe Marked Billet 80% Lower Assembly

This premium fire/safe marked billet 80% lower assembly represents a critical foundation for builders who demand exacting standards in their custom firearm projects. Engineered from solid billet 7075-T6 aluminum, this 80% lower is precisely machined to require only final material removal before completion. The integrated fire/safe markings are laser-etched to military-spec depth and clarity, ensuring permanent legibility through multiple finishing processes. For disciplined builders seeking a reliable platform that meets compliance requirements while delivering professional-grade results, this assembly provides the dimensional accuracy and material integrity necessary for a safe, functional finished product.

Overview

The premium fire/safe marked billet 80% lower assembly is manufactured to exceed standard mil-spec dimensions while offering enhanced aesthetic and functional features. Each unit begins as a solid block of 7075-T6 aluminum, a material chosen for its superior strength-to-weight ratio and corrosion resistance. The billet construction process allows for tighter tolerances and smoother surface finishes compared to forged alternatives. The lower is fully compatible with standard AR-15 upper receivers, parts kits, and magazines, requiring only the completion of the fire control pocket and trigger pin holes by the end user. The fire/safe markings are precisely positioned to align with selector positions when the lower is fully machined, eliminating guesswork during assembly.

Features & Specs

• Material: 7075-T6 aluminum billet, hard coat anodized to MIL-A-8625 Type III Class 2 specifications for wear resistance
• Integrated trigger guard machined from the same billet for increased strength and seamless appearance
• Laser-engraved fire/safe markings with .020 inch depth for durability through cerakote, duracoat, or anodizing processes
• All critical pin holes pre-drilled to .125 inch diameter with +.001 inch tolerance for consistent fitment
• Compatible with standard AR-15 mil-spec buffer tubes, pistol grips, and lower parts kits

• Bolt catch pocket, magazine catch pocket, and rear takedown pin detent holes are fully machined
• Fire control pocket dimensions: 1.000 inch width by 1.250 inch depth requiring final material removal
• Includes 1/4-28 threaded bolt catch pin and 4-40 set screw for rear takedown pin retention
• Weight: 8.9 ounces unfinished; dimensions: 8.2 inches length, 1.8 inches width at trigger guard

• Billet construction eliminates forging seams and provides consistent wall thickness throughout the receiver
• Fire/safe selector markings visible on both sides of the lower for left- and right-handed users
• Each lower is individually inspected for dimensional compliance using NIST-traceable gauges

Who It’s For

This premium fire/safe marked billet 80% lower assembly is designed for the experienced builder who prioritizes precision and reliability over expedience. It is suitable for individuals constructing a custom AR-15 platform for competition shooting, home defense, or recreational use. The billet construction and pre-marked fire/safe indicators appeal to those who value aesthetic consistency and functional clarity in their finished build. This product is not recommended for first-time builders or those without access to a drill press, milling machine, or appropriate jig system. It requires the user to complete the fire control pocket and install the fire control group, buffer tube, and associated components. The end user assumes all responsibility for legal compliance and safe operation of the completed firearm.

Shipping & FFL

This premium fire/safe marked billet 80% lower assembly is not classified as a firearm under federal law and may be shipped directly to your residential or business address without an FFL transfer. All applicable federal, state, and local laws regarding the possession and completion of 80% lowers remain the responsibility of the purchaser. Some states and municipalities restrict or prohibit the sale, possession, or completion of unserialized lower receivers. By purchasing this product, you certify that you are not prohibited from owning firearms under federal law and that you comply with all applicable regulations in your jurisdiction. We reserve the right to cancel orders that ship to restricted locations. No returns or exchanges are accepted on this item once shipped.