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9mm AR-9 80% Billet Lower (1-pack)



We're excited to introduce our new, first-of-its-kind AR-9 80 percent lower. Forget spending money on wobbly conversion blocks and mismatched parts to convert your AR-15 to 9mm.

This lower represents the easiest way to build a custom AR pistol or pistol-caliber carbine. The AR-9 lower is even compatible with factory and aftermarket Glock magazines out of the box!

AR-9 80 Percent Lower Features

This 80 percent lower ships with a proprietary Glock magazine release and 9mm ejector. All you need to complete the AR-9 lower is an 80 lower jig. See below for jig and parts compatibility.

  • Accepts Glock magazines
  • Compatible with any 80 lower jig
  • One-piece, integrated trigger guard
  • Magazine release and ejector
  • Competition mag well ramps for faster reloading
  • Backed by Lifetime Warranty
  • Proudly made in the U.S.A.


  • Caliber: 9x19mm Parabellum
  • Construction: 6061 T6 Billet Aluminum
  • Buffer Fitment: Mil-spec (1.146")
  • Finish: Type III Hardcoat Anodized

Parts Compatibility

Completing your pistol build with this lower is so easy because it works with existing black rifle parts on the market! The AR-9 80% lower is compatible with the following components:

  • Upper Receiver: AR-15 w/ 9mm barrel
  • Gas System: None
  • Lower Parts Kit: AR-15
  • Buffer System: AR-15/AR-9
  • Magazine: Glock

Because the AR-9 functions with a blowback recoil system (not gas), you don't need to install a piston or gas system. All you need is a G-9 Hybrid or equivalent bolt carrier group.

Bolt Carrier Group

To use a standard lower parts kit and AR-15 hammer, install a bolt carrrier group that is ramped (illustrated right). The G-9 Hybrid is ramped. We also recommend choosing an H3 or Pistol Buffer (5 to 8 oz.) with a standard buffer spring and tube to ensure optimal cycling and functionality.

No FFL is required to purchase this lower receiver. This 80 percent lower is not considered a firearm and is compliant with the Gun Control Act of 1968. It is also not classified as a firearm as defined in 18 U.S.C. 921(a)(3).

Made in the USA Lifetime Warranty

Shipping Restrictions

AR-15Lowerreceivers.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally. Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website. We try our best to keep our shipping page current, but laws change daily.

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.