About this product

AR9 80% Lower Fire/Safe Marked – 9mm – Billet

Overview

This AR9 80% lower fire/safe marked – 9mm – billet offers a precision-machined foundation for builders seeking a dedicated 9mm platform. Constructed from 7075-T6 aluminum billet, this uncompleted lower receiver is designed to accept standard AR-15 trigger groups and grips while accommodating Glock-pattern 9mm magazines. The fire/safe markings are laser-engraved into the billet surface for durability and clarity. As an 80% lower, it requires final machining of the trigger pocket, hammer pin holes, and safety selector detent channel before assembly. This component is intended for use with PCC (Pistol Caliber Carbine) upper receivers that support 9x19mm Parabellum cartridges.

Features & Specs

The AR9 80% lower fire/safe marked – 9mm – billet is manufactured from a single billet of 7075-T6 aluminum, which provides a tensile strength of 83,000 psi and a yield strength of 73,000 psi. The lower is Type III hard coat anodized per MIL-A-8625F, Class 2, Type III specification. The fire/safe selector markings are engraved at a depth of 0.005 inches for permanent legibility. Critical dimensions are held to +/- 0.002 inches, ensuring compatibility with mil-spec parts kits. The magazine well is specifically profiled to accept Glock 17 and Glock 19 9mm magazines without modification.

• Material: 7075-T6 aluminum billet; hard coat anodized black finish per MIL-A-8625F
• Markings: Laser-engraved Fire/Safe selector markings on both sides; caliber designation “9mm” on magazine well
• Machining tolerance: +/- 0.002 inches on all critical dimensions; unfinished trigger pocket and pin holes

Who It’s For

This AR9 80% lower fire/safe marked – 9mm – billet is designed for intermediate to advanced builders who possess a drill press, end mill, and measuring tools capable of 0.001-inch resolution. It is suited for shooters building a dedicated 9mm pistol caliber carbine or pistol using standard AR-15 lower parts kits and buffer systems, provided a 9mm-specific buffer and buffer spring are used. The fire/safe markings assist in clear selector identification for builds intended for range use, competition, or personal defense applications. This lower is not compatible with standard AR-15 magazines or 5.56/.223 upper receivers without a magazine block conversion.

• Requires: Drill press or CNC jig; 1/8-inch and 5/16-inch end mills; calipers for depth verification
• Recommended: AR-9 specific buffer weight (5.4 to 7.5 ounces) and 308 carbine buffer spring for reliable cycling
• Compatible with: Glock 17, Glock 19, and Glock 26 9mm magazines; standard AR-15 trigger groups and pistol grips

Shipping & FFL

This AR9 80% lower fire/safe marked – 9mm – billet is classified as an unfinished receiver and is not a firearm under federal law (18 U.S.C. Chapter 44). As such, it ships directly to your residence without an FFL transfer. No background check is required for purchase. Local, state, and municipal regulations vary; it is the buyer’s responsibility to verify compliance with all applicable laws before ordering. This product is shipped via UPS Ground within the continental United States. International shipping is not available. If you are unsure of your local legal requirements, consult an attorney before purchase.

• No FFL required for shipment; ships to home address in all states where legal
• Buyer must be 18 years or older; signature may be required upon delivery
• Cannot ship to: California, Connecticut, Delaware, Hawaii, Illinois, Maryland, Massachusetts, New Jersey, New York, Rhode Island, Vermont, Washington, Washington D.C., or any locality with 80% receiver restrictions