Release: Glock-Mod AR9 80% Lower Fire/Safe Marked – 9mm – Billet

About this product

The Glock-Mod AR9 80% Lower Fire/Safe Marked is a billet aluminum receiver designed for building a 9mm AR-pattern pistol or carbine that feeds from Glock magazines. It’s a fresh design for 2026, shipping fully in-stock now. As a receiver blank requiring final machining by the end-user, it provides a path to a custom firearm build under current federal regulations.

What is the Glock-Mod AR9 80% Lower used for?

This 80% lower is used for building a 9mm AR-9 pistol or carbine from the ground up. It provides the core foundation, accepting a standard AR-15 fire control group, buffer system, and aftermarket upper receivers while being specifically designed for reliable feeding from Glock-style magazines. The integrated flared mag well and CNC-machined geometry prioritize fast reloads and consistent magazine lockup, which are critical for competitive practical shooting or duty builds. Completing the final 20% of machining requires access to a drill press or milling machine and basic gunsmithing competency.

How does the Glock-Mod AR9 80% Lower compare to the Polymer80 PF940V2?

The Glock-Mod AR9 lower is superior for durability and heat dissipation in high-volume firing scenarios, while the Polymer80 PF940V2 is lighter and simpler to finish for a handgun project. Constructed from 6061-T6 billet aluminum, this receiver offers greater rigidity and mass (approximately 14.2 oz) compared to polymer frames, reducing flex under recoil and during magazine insertion. For builders focused on a pistol-caliber carbine (PCC) requiring a robust platform for thousands of rounds, this billet option is the clear winner; for a lightweight pistol build, the polymer alternative from Polymer80 remains a valid choice. Our own Glock-Mod 3.5lb Modified Cut Nub Connector would pair perfectly with the completed lower for a crisp break.

What does it weigh and what are the dimensions?

The raw, unmachined lower weighs 14.2 ounces and has critical dimensions of 7.5 inches in length, 2.4 inches in width at the mag well, and a 0.93-inch thick magazine port. These measurements ensure compatibility with standard AR-15 jigs and fixtures during the completion process. The all-metal construction contributes to this weight, which is a deliberate trade-off for the enhanced durability and stability it provides during firing, especially noticeable when paired with a heavy buffer system common in blowback AR-9 builds.

Who is this NOT for?

This product is not for first-time builders without access to proper machining tools or those seeking a ready-to-assemble, 100% complete receiver. If you lack a drill press, a solid vise, and the confidence to perform precise milling operations on aluminum, you should consider a factory-finished lower receiver instead. It’s also not ideal for builders prioritizing absolute minimum weight, as polymer alternatives like the Polymer80 PF940V2 save roughly 4 ounces. This is a component for experienced enthusiasts who understand the tools, tolerances, and legal responsibilities involved.

What’s in the box?

You receive one Glock-Mod AR9 80% Lower Receiver, machined from 6061-T6 billet aluminum with a Type III hardcoat anodized finish. No jig, drill bits, fire control parts, or other hardware are included. The product ships as a singular raw forging that has been 80% completed via CNC, leaving the end-user to finalize the fire control group pocket, selector detent holes, and trigger pin holes. Ensure you have a compatible 80% lower jig, like the widely available 5D Tactical AR-15/9mm model, before ordering.

Is the Glock-Mod AR9 80% Lower worth it at $96.04?

At $96.04, it is worth it for builders who value billet aluminum construction and specific Glock magazine compatibility over cheaper cast or polymer options. The price reflects the cost of CNC machining a solid billet and applying a mil-spec Type III anodizing, which offers superior wear and corrosion resistance compared to a basic finish. When you factor in the included fire/safe markings and the flared magwell—features often adding cost elsewhere—the value proposition is clear for a dedicated build. For a simpler, drop-in trigger component for an existing Glock, consider our compared here: Glock-Mod V3 Trigger Shoe Kit instead.