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

Overview

The ar9 80% lower fire/safe marked – 9mm – billet is a precision-machined component designed for builders who demand reliability and clear markings on their 9mm pistol or carbine platform. Manufactured from 7075-T6 billet aluminum, this 80% lower receiver features crisp, laser-engraved fire/safe selector markings that remain legible through repeated use. The billet construction provides a tight, consistent fit with upper receivers and aftermarket trigger groups, reducing slop and improving overall accuracy. As an unfinished 80% lower, it requires final machining of the fire control pocket and trigger pin holes before assembly, giving the builder full control over the final fit and finish.

Features & Specs

This ar9 80% lower fire/safe marked – 9mm – billet is engineered to accept standard AR15 lower parts kits and 9mm-specific magazines, including Glock-pattern and Colt-pattern options. The billet machining process allows for tighter tolerances than forged receivers, resulting in a smoother action and reduced wear over time. The fire/safe markings are cut directly into the aluminum and filled with high-contrast white paint for immediate visual reference.

• Material: 7075-T6 billet aluminum, hard coat anodized black for corrosion resistance
• Markings: Laser-engraved “FIRE” and “SAFE” on receiver body, with tactile indexing detent channel
• Compatibility: Accepts standard AR15 LPK, 9mm bolt catch, and Glock/Colt pattern magazines
• Manufacturer: AR9, Category: Parts

• Pocket dimensions: Pre-machined to 80% completion; trigger pocket and selector holes require final drilling
• Weight: 0.85 lbs, designed for lightweight 9mm builds without sacrificing structural integrity
• Finish: Type III hard coat anodizing per MIL-A-8625, Type III, Class 2

Who It’s For

This ar9 80% lower fire/safe marked – 9mm – billet is ideal for the experienced builder who wants a dedicated 9mm platform with clean, factory-style markings. It suits shooters who prefer billet receivers for their dimensional accuracy and aesthetic appeal, as well as those who need a lower that clearly indicates fire/safe positions without ambiguity. Whether you are building a compact pistol-caliber carbine or a competition-ready 9mm AR, this lower provides a solid foundation. It is not intended for first-time builders or those without access to a milling machine or drill press with proper jigs.

• Experienced home builders with machining tools and AR9-specific jigs
• Shooters who want a billet receiver with permanent, high-contrast fire/safe markings
• Those building a 9mm pistol or rifle that uses standard AR15 grip and stock configurations

Shipping & FFL

This item is classified as an 80% lower receiver and is not a firearm under federal regulation (ATF Ruling 2015-1). It may be shipped directly to your home or business address without an FFL transfer. However, you must comply with all applicable federal, state, and local laws regarding the purchase, possession, and completion of unfinished receivers. Some states and municipalities impose restrictions on 80% lowers; it is your sole responsibility to verify legality in your jurisdiction before ordering. By purchasing, you confirm that you are legally eligible to own firearms and that you will complete the receiver in compliance with all laws. No FFL transfer is required for shipment, but final assembly into a functional firearm may require serialization and background checks depending on your location.