Premium 80% Lower Fire/Safe Marked – Billet

For builders who demand precision from the ground up, the Premium 80% Lower Fire/Safe Marked – Billet provides a machined-aluminum foundation engineered for exacting tolerance. This 80% lower receiver is constructed from 7075-T6 aluminum billet, offering a superior strength-to-weight ratio over forged alternatives. The fire/safe markings are laser-engraved after anodizing, ensuring permanent legibility through repeated handling. Designed for the serious hobbyist or professional builder, this component requires final machining to complete the fire control pocket and trigger pin holes, allowing the end user to define the final trigger geometry and finish specifications.

Overview

The Premium 80% Lower Fire/Safe Marked – Billet represents a benchmark in unfinished receiver manufacturing. Each billet is precisely cut from solid 7075-T6 aluminum bar stock, then hard-coat anodized to MIL-A-8625 Type III specifications for wear resistance and corrosion protection. The fire/safe selector markings are positioned to standard AR-15 layout dimensions, making this lower compatible with any mil-spec fire control group after completion. The 80% completion state means all external dimensions are final, including the buffer tube threads, takedown pin lugs, and magazine catch recesses. Only the trigger pocket, hammer pin holes, and selector detent channel require finishing by the end user, typically with a jig and router or drill press.

Features & Specs

The Premium 80% Lower Fire/Safe Marked – Billet includes several specification-driven features that distinguish it from economy-grade blanks. The billet construction allows for tighter dimensional consistency compared to forged receivers, with critical surfaces machined to +/- 0.002 inch tolerance. The fire/safe markings are laser-etched at 30-degree arc intervals, matching standard selector throw angles.

• Material: 7075-T6 aluminum billet, stress-relieved and aged per AMS 4125
• Finish: Type III hard coat anodizing, black, per MIL-A-8625, 0.002 inch minimum coating thickness
• Markings: Laser-engraved “FIRE” and “SAFE” indicators on selector pocket, opposite side marked “SEMI” and “BURST” position indicators

• Compatibility: Standard AR-15 mil-spec lower parts kit, buffer tube, and stock assembly
• Weight: 11.2 ounces as shipped, approximately 10.8 ounces after completion
• Pocket dimensions: Trigger pocket pre-machined to 1.240 inch depth, requires final 0.200 inch removal to complete

• Hardness: Rockwell B 85-90 after heat treatment, ensuring thread integrity for grip screw and buffer tube
• Proof load: Tested to 20,000 PSI in completed state per SAAMI guidelines
• Warranty: Manufacturer defects in billet material or machining covered for 1 year from purchase

Who It’s For

The Premium 80% Lower Fire/Safe Marked – Billet is intended for experienced firearms builders who possess the tools and knowledge to complete an 80% lower receiver. This product is suited for individuals who require a precision platform where they control the final trigger fit, pin alignment, and surface finish. It is not recommended for first-time builders without prior experience using a lower receiver jig or machining aluminum. The fire/safe markings are pre-applied to eliminate a common post-completion step, saving the builder time and ensuring correct orientation. This lower is ideal for custom builds where the builder selects every component from the ground up, including the trigger pack, grip, and stock.

Shipping & FFL

This Premium 80% Lower Fire/Safe Marked – Billet is an unfinished receiver blank classified by ATF as a non-firearm component. It does not require transfer through a Federal Firearms License (FFL) dealer and can be shipped directly to your residential or business address. Shipment is via UPS Ground or FedEx Home Delivery with adult signature required. International shipping is not available. The buyer assumes all responsibility for compliance with local, state, and federal laws regarding the possession and completion of 80% lower receivers. It is the buyer’s responsibility to verify that owning and completing this component is legal in their jurisdiction. No warranty is expressed or implied regarding the legality of completion or use in any specific location.