MEAN Arms ExoMag 9mm Conversion Mag
Ammo prices are down from the shortage prices a few years ago. That doesn’t mean that they’re cheap, but some ammo is definitely more affordable than others. 9mm is about as cheap as you can get in centerfire ammunition, and it might make you wish you’d picked up a 9mm AR.
If you have a rifle caliber AR-15 and want to drop a 9mm upper on it, you can always get a mag well adapter that uses pistol mags or Colt SMG mags.
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