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. They have videos that show this gizmo working flawlessly, even on full auto. I am guardedly optimistic, this looks like it works and it will make training with 9mm much easier, no more dedicated lowers. They work with Glock or Colt variant 9mm Bolt Carrier Groups. Pre-order discounted price will be $24.99 each or a 3-pack for $68.99.

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.
  • Not a picky eater. Shoots all 9mm munitions. 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.

THIS IS A PRE-ORDER PRODUCT AND CONTAINS SPECIAL PRE-ORDER PRICING.  DO NOT ORDER IF YOU ARE EXPECTING THIS TO BE SHIPPED SOON!  If you pre-order, you will be one of the first to receive the EndoMag.  Pre-orders projected to have deliveries sometime late summer.

You can pre-order your very own Mean Arms Endomage HERE

ENDOMAG Package Selection

One mag $24.99

Three mags $68.99

Photo courtesy of