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The Magpul FMG-9 (Folding submachine Gun) is a prototype foldable submachine gun developed by Magpul Industries. It is a lightweight weapon built around the Glock 18 and based off the design of older submachine guns like the UC-M21 and ARES FMG, where it is able to fold up into a small box like package. This, coupled with the weapon's small size, allows it to be easily concealable. Developed as a show piece for SHOTSHOW 2008, Magpul has not announced any plans to actually produce the weapon.
"The FMG-9 is one of a new generation of lightweight folding submachine guns that can be easily concealed or disguised. The FMG-9 is only slighty larger than pistol-size, making it good in close quarters."