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Magazine Insert to Convert Your AR Lower to 9mm: Mean Arms EndoMag

The Mean Arms EndoMag makes a big claim. They say their magazine insert converts your Gen 2 or Gen 3 5.56/.223 PMAG® housing into a 9mm magazine to use with a standard AR lower and 9mm upper.I have been shooting one all week, they work, every time.

Millions of you guys bought an AR lower back during one of the panics. If you have a lower and a Magpul magazine sitting around, $29.99 and a 9mm upper will turn it into a training gun that uses mags the same size as 5.56 mags. The mags can be converted back to 5.56 in seconds.

Do you live in a state where your freedom is regulated? No worries. The Endomag has a built in tab which limits capacity to 10 rounds. It is marked at 15, 20 and 30, you can cut the tab to fit your circumstances. You can always increase the capacity up to a maximum of 30 with a pair of wire cutters.

All the AR controls work just they way they are supposed to including last round bolt hold open and they fit in your mag pouches. No more dedicated lowers, EndoMags work with Glock or Colt variant 9mm Bolt Carrier Groups. They even have a version that works with the CMMG Guard uppers.

Magazine Insert Converts Your AR Lower to 9mm: Mean Arms EndoMag
The Mean Arms EndoMag Magazine Insert Converts Your AR Lower to 9mm

Features the Mean Arms 9mm Magazine Adapter:

  • Quickly and easily change calibers from .223/5.56 to a caliber associated with the caliber converter in a Magpul 30-round 5.56×45 PMAGsⓇ (Gen 2 and 3)
  • Functions as a magazine!
  • No magwell adapter needed!
  • Keep your standard 5.56 Multi Caliber lower receiver!
  • Comes fully assembled.
  • No tools required.
  • Keep all your PMAGsⓇ in use, no need to buy additional or specific 9mm magazines.
  • Keep your muscle-memory reload-training the same between calibers! Same magazine, same draw, same feel.
  • No learning curve when reloading because it is the same magazine you already use!
  • Use most of your PMAGⓇ accessories: i.e. mag pouches, storage racks, decals, caliber indicators, etc.
  • Shoots all types of 9mm rounds. Hollow points included.

Firearm used in video: Colt AR-15 semi auto 9mm Model AR6951 (with Colt mag well adapter removed to accommodate standard 5.56/.223 PMAG®)

Key Functions

  • No modifications to your 5.56×45 lower!  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 AR15 should function.
  • Built-in ejector designed to perform under intense conditions.
  • Convert your 5.56×45 PMAGⓇ to 9mm in seconds, and easily convert back to 5.56 without damaging your PMAGⓇ. No permanent changes to anything!
  • Specially formulated polymer.

You can your very own Mean Arms Endomage HERE

About the Author /

Mark Miller is a former Customs Agent and a Green Beret who served in Afghanistan and a number of other live fire locations. A student of firearms and shooting, he is an FFL and a SOT. The guiding philosophy of his life is that terrain and situation dictate tactics and the enemy always gets a vote on any plan.

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