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3 of 3 Items

The AR9 80% lower is the answer to all those wobbly and unreliable AR-15 9mm box conversion kits. With the 9mm AR-type carbine exploding in popularity, it only made sense to introduce a dedicated 9mm 80% lower receiver that was reliable and required no box conversion to use 9mm magazines. 

Compatible with Glock® Magazines, AR-15 Parts

Most AR9s and PCCs function with either Glock® or Colt SMG magazines. We chose Glock® compatibility for their magazines' availability, quality, and generally low prices. No custom components or fitment is required to make your AR9 lower function. The magazine well is designed specifically for all factory and aftermarket Glock® mags, and the magazine release and ejector both come installed for easier assembly.

To make assembly even easier, we made sure these AR9 lowers work with mil-spec AR-15 components, too. That means you'll still use a standard AR-15 lower parts kit and trigger, buffer tube, recoil spring, and pistol brace or buttstock. Since the exterior dimensions are so similar to that of an AR-15 5.56/.223 receiver, the typical AR-15 80% jig will work for cutting and drilling your 9mm lower, too. Jigs will be marked as such for your convenience.

AR9 Bolt Carrier Group Compatibility

To complete your build, we recommend selecting an AR9 upper assembly or build kit that utilizes the PSA G-9 Hybrid Bolt Carrier Group (compatible with stripped AR-15 uppers, Glock® magazines, and the AR9 80% lower). All AR9 pistol kits include the G-9 BCG and appropriate upper assembly. If you opt for another type of 9mm upper, ensure you select a BCG that is ramped on the underside. 

Why an 80% Lower for the AR9?

Why not just buy a stripped lower receiver? Using an 80% lower for your AR9 build means you don't have to pay extra for a special, brand-name receiver that's dedicated for the AR9 platform. Since 80% receivers aren't considered firearms, they don't require an FFL, backgroundcheck, extra taxes, or transfer paperwork to buy and own under federal law. That saves you money that you can spend on custom parts, accessories, ammo, and gear.

AR9 Lower Specifications:

  • Caliber: 9x19mm Parabellum
  • Construction: 6061 T6 Billet Aluminum
  • Buffer Tube: Mil-spec fitment (1.146")
  • Finish: Type III Hardcoat Anodized
  • Gas System: (None) Blow-back

Legal to Build Under Federal Law

AR9 receiver blanks and all other 80% lower receivers are not considered firearms under the ATF's policies or federal law. These units can be bought, shipped, and owned in most states without the need to conduct a background check. You don't need to visit an FFL or have your 80% lower transferred with paperwork, nor does it need to be serialized under federal law. 

State Laws May Vary

Contrary to federal law, some states have either restricted or banned the sale, transfer, and ownership of 80% lowers, firearm blanks, and other gun parts. Because of these restrictions, we cannot ship our products to certain states. Please confirm whether your state is restricted on our Shipping & Return Policy before placing an order. We cannot fulfill orders to restricted states if placed.

Your custom AR9 build awaits.


DISCLAIMER: “GLOCK” is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. and GLOCK Ges.m.b.H. Neither AR-15LowerReceivers, a/k/a Tactical Gear Heads, LLC nor this site are affiliated in any manner with, or otherwise endorsed by, GLOCK, Inc. or GLOCK Ges.m.b.H. The use of “GLOCK” on this page is merely to advertise the sale of GLOCK pistols, parts, or components. For additional genuine GLOCK, Inc. and GLOCK Ges.m.b.H products and parts visit

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.