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

Overview

If you are building a dedicated 9mm pistol or rifle, the AR9 80% lower fire/safe marked – 9mm – billet is the foundation you want in your hands. This billet lower is pre-marked with crisp fire and safe engravings, so your finished build looks clean and professional without any extra work. Machined from a solid block of 6061 aluminum, it gives you the strength and precision of a factory lower while letting you complete it on your own terms. Whether you are a first-time builder or a seasoned hobbyist, this AR9 80% lower fire/safe marked – 9mm – billet is ready for your jig and router.

Features & Specs

This lower is designed specifically for 9mm Glock-style magazines, so you get reliable feeding and a slim grip profile. The billet construction means tighter tolerances and a smoother finish compared to forged lowers. Here is what you can expect out of the box:

• Billet 6061 aluminum construction with a Type III hard coat anodized finish for durability and corrosion resistance.
• Pre-engraved fire and safe markings on the selector positions — no need to add your own markings after completion.
• Compatible with standard AR15 lower parts kits and 9mm Glock-pattern magazine adapters or dedicated lower receivers.

Because this is an 80% lower, it does not include a fire control group, stock, or buffer tube. You will need to complete the fire control pocket, trigger pin holes, and selector detent channel using a jig and router or drill press. The rear takedown lug and bolt catch recess are already machined, saving you time on the finishing process.

• No serial number, no FFL transfer required for the raw lower (check your local and state laws before purchasing).
• Accept most AR9 upper receivers with standard barrel and bolt setups.
• Integrated last-round bolt hold-open compatible with Glock-style magazines.

Who It’s For

This AR9 80% lower fire/safe marked – 9mm – billet is for the builder who wants a dedicated 9mm platform without the hassle of a stripped, serialized receiver. It is ideal for shooters who want to keep a single caliber platform for range days, competition, or home defense builds. The fire/safe markings make it a great choice if you prefer a traditional selector layout, and the billet finish gives your build a premium look without the premium price tag. If you already have a 9mm upper and a Glock-pattern magazine collection, this lower is the missing piece. It also works well for anyone who wants to learn the 80% finishing process on a straightforward, single-caliber build.

• Best suited for DIY builders with access to a jig, router, and basic tools.
• Recommended for shooters who want a lightweight, low-recoil 9mm AR platform.
• Great for those who prefer Glock magazine compatibility over Colt or other patterns.

Shipping & FFL

Because this is an 80% lower receiver and not a completed firearm, it ships directly to your door without an FFL transfer. No background check is required for the raw lower, and we will ship it to the address you provide during checkout. However, you are responsible for understanding and complying with all federal, state, and local laws regarding 80% receivers. Some states and localities restrict or regulate 80% lowers, including requirements for serialization, background checks, or outright bans. By purchasing this AR9 80% lower fire/safe marked – 9mm – billet, you confirm that you are legally allowed to own and complete it in your jurisdiction. We recommend checking with your local law enforcement or an attorney if you have any questions. Once completed, the firearm must comply with all applicable laws, including NFA regulations if you intend to build a short-barreled rifle.