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Description
The MEAN ExoMag is designed to be the most reliable and best feeding 9mm magazine for use with a standard AR lower. The ExoMag has a STANAG magazine outer shape. Add the 9mm upper of your choosing to function with a Glock or Colt variant 9mm BCG. Mean offers both a version with an EJECTOR (for standard blowback bolts) and an EJECTORLESS version (for our Bearing Delay and CMMG Radial Delay systems). All ExoMag models include the last round bolt-hold open feature, as any AR-15 should.
Bearing Delay Upper owners: Customers with the Bearing Delay system should select the “Ejectorless” option above.
CMMG Radial Delay owners: If you have a CMMG Radial Delay firearm, select the “Ejectorless” option above.
ExoMag features:
- Facilitates quick and easy caliber change from .223/5.56 to 9mm
- Functions as a magazine!
- No magwell adapter needed!
- Keep your standard 5.56 Multi Caliber lower receiver!
- Comes fully assembled.
- No tools required.
- Build and maintain your muscle-memory for reloads and other training from your 5.56 firearms! Same STANAG magazine, same draw, same feel.
- No learning curve when reloading because it is the same magazine you already use!
- Use most of your STANAG mag accessories: i.e. mag pouches, storage racks, decals, caliber indicators, etc.
- Not a picky eater. Shoots all 9mm ammo – hollow points included.
- It is exclusively the customer’s responsibility to be aware of all applicable laws and regulations regarding the purchase and ownership of magazines and the capacities thereof. Customers residing in states with intrusive laws who purchase standard capacity magazines may have their order canceled without warning.
Key Specs:
- No modifications to your 5.56×45 lower receiver! Changing calibers is now simply a complete 9mm upper for your AR platform. No nuts, no bolts, no drilling, no bull.
- Last round bolt-hold open feature, just as an AR-15 should function.
- Specially formulated polymer.
Magazine Restriction
Please check with your state regulations for ownership of large capacity magazines.
Additional information
| Weight | N/A |
|---|---|
| Dimensions | N/A |
| Magazine Capacity | 10, 15, 20, 32, 40 |
| Style | Ejector, Ejectorless |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
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Brian 
US
Customer Reviews
5.0
Based on 1 Reviews
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B
US
09/17/2025
40rd mags
These new mags are awesome. I have the insert mags and the one thing I wanted was a metal ejector. And these mags have a metal insert. Also I bought 2, and ran them this weekend with my son, and we had zero feed issues out of 400 rounds. Great mags
