Premium Fire/Safe Marked Billet 80% Lower Assembly

When building a custom AR-platform firearm from the ground up, the foundation matters. The premium fire/safe marked billet 80% lower assembly delivers the precise machining and robust construction required for a serious build. Designed for the builder who refuses to compromise on quality, this lower assembly starts as a fully machined 80% blank with clearly marked fire and safe selector positions, saving you the time and risk of engraving while maintaining compliance with ATF guidelines for an unfinished receiver. Every unit is crafted from solid billet 7075-T6 aluminum, ensuring structural integrity from the first jig setup to the final function check.

Overview

The premium fire/safe marked billet 80% lower assembly is a precision-machined, unfinished lower receiver that requires final milling to complete. It arrives with the fire and safe markings laser-engraved at the factory, eliminating the need for post-completion engraving while keeping the receiver in an unfinished state under federal regulations. This assembly is compatible with standard AR-15 mil-spec parts kits and is designed for builders who want a clean, factory-finished look without the wait or cost of custom engraving. Every pocket, trigger guard, and buffer tower is machined to tight tolerances, reducing the risk of fitment issues during assembly.

Features & Specs

• Billet 7075-T6 Aluminum Construction: Machined from a solid block of certified aircraft-grade aluminum for superior strength, dimensional accuracy, and resistance to stress fractures compared to forged or cast alternatives.
• Factory-Engraved Fire/Safe Markings: Permanent laser-engraved selector markings on both sides of the receiver, clearly indicating safe and fire positions with sharp, legible text that will not wear or fade over time.
• Mil-Spec Trigger Pocket and Pin Holes: Precision-cut trigger pocket with standard 0.154-inch trigger pin holes, compatible with all mil-spec and most drop-in trigger groups without modification.

• Integrated Trigger Guard: One-piece billet design includes a machined trigger guard with a fully enclosed profile, eliminating the need for a separate trigger guard assembly and reducing potential failure points.
• Anodized Black Finish: Type III hard coat anodized finish per MIL-A-8625 for abrasion resistance, corrosion protection, and a consistent matte appearance that matches standard AR-15 upper receivers.
• Threaded Bolt Catch Pin: Utilizes a threaded bolt catch pin for secure retention, reducing the risk of the pin walking out during operation compared to standard roll pins.

• Dimensions: Standard AR-15 lower receiver dimensions. Weight: approximately 10.5 ounces unfinished. Requires standard AR-15 jig and router or drill press for completion.
• Compatibility: Accepts all mil-spec AR-15 upper receivers, buffer tubes, and lower parts kits. Does not include jig, end mill, or drill bits.

Who It's For

This premium fire/safe marked billet 80% lower assembly is intended for experienced firearm builders and hobbyists who have the tools and knowledge to complete the machining process. It is not for first-time builders without proper jig setup experience or for those seeking a ready-to-fire receiver. Ideal candidates are individuals who value the structural benefits of billet construction, who prefer factory-applied markings for a professional finish, and who understand the legal requirements surrounding 80% receivers. This product is not a firearm and cannot be shipped directly to a residence in restricted states without dealer involvement. If you are unsure about your ability to complete this receiver, consult a qualified gunsmith or experienced builder before purchasing.

Shipping & FFL

This premium fire/safe marked billet 80% lower assembly is classified as an unfinished receiver and is not a firearm under federal law. It ships directly to your doorstep within the contiguous United States with no FFL transfer required at the time of purchase. However, some states and local jurisdictions impose restrictions on the sale or possession of 80% receivers. It is your sole responsibility to verify that ownership and completion of this product are legal in your city, county, and state. By purchasing this item, you confirm that you are at least 21 years of age, are not a prohibited person under federal or state law, and will comply with all applicable laws regarding the completion and registration of this receiver. We reserve the right to refuse or cancel any order that appears to violate relevant statutes. For questions about your specific jurisdiction, consult a licensed attorney or your local firearms regulatory authority prior to ordering.