Mean Arms Exomag 9mm Luger 40 Round With Ejector Black

The Mean Arms Exomag 9mm Luger 40 round magazine with ejector is built for shooters who want to run 9mm through a standard AR lower without a magwell adapter or permanent modifications. Swap your .223/5.56 upper for a 9mm upper, drop in this magazine, and you're ready to train or hunt with a completely different caliber while keeping your lower receiver untouched. The ejector variant works with standard blowback 9mm bolt carrier groups—including Glock and Colt variants—making it a plug-and-play choice for most 9mm AR builds.

Built from specially formulated polymer, the Exomag maintains the same STANAG profile as your existing AR magazines, so it feeds like a standard magazine and works with all your current mag pouches, storage racks, and other accessories. There's no learning curve: the draw, the feel, the reload sequence—it's identical to what you already know. And because it accepts all 9mm ammunition types (including hollow points), you're not limited by ammo availability or your particular reloading preferences.

The last-round bolt-hold-open feature means your rifle behaves exactly like a full-power AR should. No compromises, no work-arounds. Comes fully assembled and ready to load out of the box. Just make sure you're compliant with local and state magazine capacity laws before ordering.

Key Features

• 40-round 9mm capacity with standard STANAG profile
• Ejector design for standard blowback 9mm BCG (Glock/Colt variants)
• Last-round bolt-hold-open functionality
• Compatible with existing AR mag accessories—pouches, racks, and carriers
• Accepts all 9mm ammunition types, including hollow points
• No modifications to lower receiver required
• Fully assembled; ships ready to use
• Specially formulated polymer construction

Specifications

Frequently Asked Questions

Will this 9mm magazine work with my standard AR-15 lower receiver?

Yes. The Exomag maintains the standard STANAG outer profile, so it loads into any AR-15 lower just like your existing .223/5.56 magazines. No magwell adapter, no drilling, no permanent modifications.

Which 9mm upper/BCG does this magazine work with?

The ejector version is designed for standard blowback 9mm bolt carrier groups, including Glock and Colt variants. If you run a Mean Arms Bearing Delay upper or a CMMG Radial Delay system, you'll need the ejectorless version instead.

Can I use my existing mag pouches and accessories with this magazine?

Yes. Because it uses the standard STANAG profile, it works with existing AR mag pouches, storage racks, caliber indicators, and other accessories you already own.

What ammo does the Exomag feed reliably?

The magazine is not picky about ammunition type. It feeds standard full-metal-jacket, hollow-point, and other common 9mm Luger loads.