Polymer80Central AR-9 80% Lower Receiver, Billet 9mm – Fire/Safe Marked

Our Price: $93.49

This isn’t just another lower. This is a dedicated, billet 9mm lower built from the ground up for reliability and a clean build. If you’re putting together an AR-9, starting with a purpose-built foundation is the only way to go.

We start with a solid block of 6061-T6 billet aluminum. It’s CNC-machined to exacting standards, giving you a receiver that’s rigid and perfectly in-spec. The Type III hardcoat anodizing isn’t just for looks; it’s a battle-grade finish that stands up to wear, solvents, and the elements.

Function is where this lower really separates itself. The mag well is flared and features enlarged ramps. This isn’t a subtle cosmetic touch—it’s a functional advantage that guides your magazine home for faster, positive reloads every time. It’s built for use, not just for show.

Built for Glock Mags. Built in the USA.

Compatibility is simple: it runs on Glock. Use your Glock OEM or aftermarket Glock-pattern magazines (like ETS). This commonality means proven, abundant mags and a seamless fit. The integrated trigger guard is robust and ready for any glove, and the critical Fire and Safe markings are deeply engraved for permanence.

This is a 100% Mil-Spec fitment, so it will pair correctly with your standard AR-9 upper receiver and parts kits. Remember, finishing an 80% lower requires tools, skill, and knowledge of federal and state laws. It is your responsibility to comply with all regulations.

For your next 9mm PCC build, start with a solid American-made billet lower designed for function. Add to cart and get started.