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

Overview

This AR9 80% lower receiver is machined from solid billet 6061-T6 aluminum and features permanent Fire/Safe markings on both sides. Designed for the 9mm platform, this lower gives you the foundation to complete a custom pistol caliber carbine or PDW build. The 80% configuration means you finish the fire control pocket and trigger pin holes at your own pace, with no serial number required until you complete the machining. If you are looking for a clean, ready-to-mark lower that accepts standard AR15 small parts and Glock-pattern magazines, this AR9 80% lower fire/safe marked – 9mm – billet is a direct choice for your next build.

Features & Specs

Manufactured by AR9, this billet lower is precision machined to tight tolerances. The Fire/Safe markings are engraved deep into the aluminum, so they will not wear off during finishing or Cerakote. The 9mm-specific magazine well is designed for reliable feeding with Glock-style magazines, and the rear takedown pin lug is reinforced for added durability. Every lower is deburred and cleaned before packaging, reducing your prep time.

• Billet 6061-T6 aluminum construction with type III hard coat anodized finish
• Permanent Fire/Safe markings on both sides of the receiver
• Accepts standard AR15 LPK, buffer tube, and grip – uses Glock-pattern 9mm magazines

All critical dimensions, including the trigger pocket, hammer pin, and trigger pin holes, are left undersized per 80% specifications. The bolt catch recess is fully machined, and the rear shelf is compatible with standard end plates and castle nuts.

• Reinforced rear takedown pin lug – integral to the billet design
• Flared magazine well for faster reloads
• Integrated trigger guard – no separate guard needed

Who It’s For

This AR9 80% lower fire/safe marked – 9mm – billet is intended for builders who want a dedicated 9mm platform without modifying a standard AR15 lower. Whether you are assembling a lightweight competition pistol caliber carbine, a suppressed home defense PDW, or a range toy with a binary trigger, this lower provides the correct geometry for 9mm bolt travel and magazine alignment. It is also suitable for first-time 80% builders who want a straightforward machining project with clearly marked safety positions. The Fire/Safe markings eliminate guesswork during assembly and final function checks.

Shipping & FFL

Because this is an 80% lower receiver, it is not classified as a firearm by the ATF. It ships directly to your door with no FFL transfer required. No background check, no 4473, and no waiting period. You must complete the machining of the fire control cavity and trigger pin holes before it becomes a functional receiver. Check your local and state laws before ordering, as some jurisdictions regulate 80% receivers. This product is sold as a raw forging for educational, hobbyist, and gunsmithing purposes. By purchasing, you confirm you are legally allowed to possess and finish this component in your jurisdiction.

• No FFL transfer needed – ships to any residential or business address
• Must be machined to completion by the end user
• Buyer is responsible for compliance with all federal, state, and local laws