Description

Premium Fire/Safe Marked Billet 80% Lower Assembly

This premium fire/safe marked billet 80% lower assembly represents a cornerstone component for builders who demand precision and compliance from the ground up. Machined from solid 7075-T6 aluminum billet, this lower receiver is designed for those who require a clean, reliable platform for their custom AR-15 build. The fire/safe markings are laser-engraved to military-spec depth and clarity, ensuring permanent legibility without compromising the lower’s structural integrity. As an 80% receiver, it requires final machining before assembly, placing full control of the build process in your hands while maintaining compliance with all federal firearm regulations.

Overview

The premium fire/safe marked billet 80% lower assembly is precision-machined from a solid billet of 7075-T6 aluminum, then hard-coat anodized in a matte black finish for superior durability and corrosion resistance. Every unit is manufactured to mil-spec dimensions, ensuring seamless compatibility with standard AR-15 upper receivers, trigger groups, and buffer systems. The fire/safe selector markings are deep-engraved to prevent wear over time, and the integral trigger guard is reinforced for added strength. This lower assembly is sold as a non-functional blank, requiring the end user to complete the fire control pocket and trigger pin holes before it can be assembled into a functional firearm.

Features & Specs

• Premium 7075-T6 aluminum billet construction with Type III hard-coat anodized finish for maximum strength and wear resistance
• Deep laser-engraved fire/safe markings on both sides, compliant with ATF marking guidelines for completed receivers
• Precision-machined magazine well with beveled opening for reliable magazine insertion; integral trigger guard and reinforced rear takedown lug

Key specifications include a mil-spec buffer tube threading diameter of 1.125 inches, standard AR-15 pivot and takedown pin dimensions, and a weight of 10.2 ounces before final machining. The billet construction eliminates casting voids and provides a tighter grain structure compared to forged receivers, resulting in a more rigid platform with cleaner exterior lines. Each lower assembly is individually inspected for critical tolerance points including the trigger pocket width, safety selector hole alignment, and magazine catch recess depth.

Who It’s For

This premium fire/safe marked billet 80% lower assembly is intended for experienced builders who have the necessary tooling and expertise to complete the fire control pocket and install a trigger group. It is ideal for enthusiasts who want a high-quality foundation for a custom pistol or rifle build without the paperwork associated with a completed lower receiver. This product is also suitable for gunsmiths and manufacturers who require a stock of unmarked, serialized-clean lowers for proprietary builds. If you are a first-time builder, we recommend reviewing the ATF guidelines on 80% receivers and ensuring you have access to a drill press, jig, and appropriate end mills before purchasing.

Shipping & FFL

This product ships directly to your address with no FFL transfer required, as it is classified as a non-gun component under federal law. However, once you complete the machining process and assemble it into a functional firearm, you must comply with all applicable federal, state, and local laws regarding the possession and transfer of firearms. This includes restrictions in certain states and localities that regulate 80% receivers. We recommend verifying your local laws before ordering. This lower assembly is not a finished firearm and cannot be transferred through an FFL. No background check is required for purchase, but the end user assumes full responsibility for legal compliance during and after the build process.