4 Foldable Submachine Guns
Submachine guns have been around for the better part of a century. They are the intermediate go-to firearm between a handgun and a carbine and have multiple niche uses in military, law enforcement scenarios, and personal defense. One isolated branch of subgun development however has been in the arena of the inconspicuous foldable submachine gun; and it is indeed one weird branch of firearms.
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