This is a double magazine pouch that was used by the US Air Force. The pouch can fit most double stacked 9mm pistol mags, such as M9 magazines. A hook and loop flap secures the magazines. The plastic retention insert helps hold mags more securely when pouch is open. You can mount this pouch to any MOLLE compatible surface.
This pouch comes as a part of the Defensor Fortis kit.