Premium Fire/Safe Marked Billet 80% Lower Assembly

Designed for the discerning builder who demands precision from the ground up, this premium fire/safe marked billet 80% lower assembly represents a critical foundation for your custom AR-platform project. Machined from a solid block of 7075-T6 aluminum, this component offers the dimensional integrity and material strength expected by serious hobbyists and professional armorers alike. The fire/safe markings are laser-engraved to military-spec depth and clarity, ensuring long-term legibility through multiple finish applications. As an 80% lower, this assembly requires final machining of the fire control pocket and trigger pin holes, placing you in control of the build process while adhering to current ATF guidelines regarding unfinished receivers.

Overview

This premium fire/safe marked billet 80% lower assembly is constructed using billet machining techniques that provide tighter tolerances and sharper geometry compared to forged alternatives. The 7075-T6 aluminum alloy offers superior tensile strength and corrosion resistance, making this lower suitable for both range use and demanding field conditions. The billet construction allows for enhanced material density around critical stress points, including the buffer tube threads and trigger pin lugs. Each unit undergoes dimensional inspection to verify compliance with mil-spec blueprint standards before leaving the manufacturing facility.

Features & Specs

• Material: 7075-T6 aluminum billet with hard-coat anodized finish in black; exceeds mil-spec hardness requirements for wear resistance
• Markings: Laser-engraved SAFE and FIRE selectors with depth-controlled engraving to prevent fade; includes caliber and serial number placement zones
• Dimensions: 0.250-inch wall thickness at critical receiver sections; machined trigger guard with 0.870-inch opening for gloved use; accepts all mil-spec lower parts kits

The premium fire/safe marked billet 80% lower assembly also features a flared magazine well for rapid reloads and a rear takedown pin detent pocket machined to 0.125-inch depth for positive pin retention. The trigger pocket is roughed to within 0.020 inches of final spec, reducing your machining time while maintaining stock for custom trigger geometry. All pin holes are pilot-drilled to 0.125 inches for easy finishing with standard jigs and end mills.

Who It’s For

This premium fire/safe marked billet 80% lower assembly is intended for experienced builders who own or have access to a drill press or CNC mill and understand the legal requirements for completing an unfinished receiver. It is ideal for those who prefer billet aesthetics and tighter tolerances over forged receivers, as well as builders who want a lower that is ready for custom cerakote or other finish applications without the need to remove shallow markings. This product is not suitable for first-time builders who lack experience with 80% lower jigs or proper machining techniques.

Shipping & FFL

This premium fire/safe marked billet 80% lower assembly ships directly to your door as an unfinished receiver. No Federal Firearms License (FFL) transfer is required for purchase or delivery, as this product does not meet the definition of a firearm under the Gun Control Act of 1968 when sold in its current state. However, once you complete the machining process to create a functional receiver, you must comply with all applicable federal, state, and local laws regarding firearm possession and serialization. Some states and localities restrict the ownership or completion of 80% lowers. It is your responsibility to verify that this product is legal to own and finish in your jurisdiction before placing an order.