About this product

Premium 80% Lower Fire/Safe Marked – Billet

Engineered for builders who demand precision from the ground up, the Premium 80% Lower Fire/Safe Marked – Billet delivers a superior foundation for your next AR-platform project. Machined from a solid block of 7075-T6 aluminum, this lower receiver offers the dimensional stability and corrosion resistance expected by serious gunsmiths and custom rifle assemblers. The fire/safe markings are laser-etched after Type III hard coat anodizing, ensuring the legends remain legible through repeated handling and cleaning cycles. Every 80% lower is produced to mil-spec pocket dimensions within +/- 0.001 inch tolerances, providing a true drop-in fit for all standard LPKs and upper receivers.

Overview

The Premium 80% Lower Fire/Safe Marked – Billet is a raw forging that requires final machining of the trigger pocket, fire control group holes, and selector shaft channel before becoming a functional receiver. This billet 80% lower starts as a 7075-T6 aluminum extrusion, then undergoes CNC machining to create the magazine well, buffer tube threads, and takedown pin lugs. The fire/safe markings are laser engraved at 30 watts for permanent contrast without raising the anodized surface. Unlike forged lowers, this billet variant exhibits no parting lines or mold flash, offering a smoother overall aesthetic. Each unit is individually serialized for inventory tracking but remains an unfinished receiver under ATF guidelines until material is removed from the fire control cavity.

Features & Specs

• Material: 7075-T6 aluminum billet, stress-relieved and precision machined with 0.001-inch positional accuracy on all critical datums including the trigger pin and hammer pin holes
• Marking: Laser-etched “FIRE” and “SAFE” legends on both sides of the selector pocket, positioned 0.350 inches from the pocket centerline for clear visibility with standard grips
• Finish: Mil-spec Type III Class 2 hard coat anodizing in black, 0.002-inch minimum coating thickness tested via eddy current to ASTM B244 standards

• Pocket dimensions: 1.240-inch trigger slot width with 0.125-inch radius corners, pre-drilled 0.250-inch pilot holes for FCG pins requiring final reaming to 0.1545 inches
• Threading: 1.250-inch-18 UNEF buffer tube threads, cut with single-point tooling to class 2A fit for aftermarket tubes and stocks
• Weight: 10.8 ounces unfinished, with approximately 1.2 ounces of material removed during final machining of the fire control pocket

• Compatibility: Accepts all mil-spec AR-15 lower parts kits, drop-in triggers, and pistol grip configurations without modification to the fire/safe marked selector channel
• Takedown pin lugs: 0.246-inch diameter, broached to 0.250 inches for positive lock-up with upper receivers from Aero Precision, BCM, and other major manufacturers
• Magwell: Beveled opening with 0.030-inch chamfer for rapid magazine insertion, compatible with standard 5.56 NATO and .300 Blackout magazines

Who It’s For

The Premium 80% Lower Fire/Safe Marked – Billet targets intermediate to advanced builders who already possess a drill press, end mill, or CNC router with a 1/8-inch end mill for fire control pocket work. This is not a starter kit for first-time builders; it requires precise measurement tools, a drill press vise, and familiarity with 80% lower jigs from manufacturers such as 80% Arms, Easy Jig, or Modulus. Gunsmiths who value the billet aesthetic over forged receivers will appreciate the crisp fire/safe markings that align perfectly with standard selector levers without bushing modifications. Custom rifle assemblers building precision ARs for competition or hunting will benefit from the tighter tolerances inherent in billet machining versus forging processes. This product is also suitable for collectors who prefer to maintain an unfinished receiver inventory for future builds, provided they comply with all state and local regulations regarding 80% lowers.

Shipping & FFL

This Premium 80% Lower Fire/Safe Marked – Billet ships directly to your residence or business address without requiring transfer through a Federal Firearms License (FFL) dealer, as it is classified by the ATF as an unfinished receiver that is not yet a firearm under the Gun Control Act of 1968. However, you must be at least 21 years of age and comply with all applicable state and local laws regarding the possession and final machining of 80% firearm components. Some states, including but not limited to California, Connecticut, New Jersey, New York, and Washington, impose restrictions on the purchase, transfer, or possession of unfinished receivers. It is your sole responsibility to verify that owning and completing an 80% lower is legal in your jurisdiction before placing an order. By purchasing this item, you acknowledge that the product is sold as a raw component for educational and hobbyist purposes only, and that the final machining and assembly of a functional firearm is subject to all federal, state, and local regulations. We reserve the right to refuse or cancel orders that appear to violate applicable laws.