Hmm. That might be a little tricky.
Some larger mods such as FOOK and Project Nevada have a lot of cool features build in with it, as well as adding an array of weaponry. They both include a few one-handed sub-machine guns, as far as I know.
Also, Classic Fallout Weapons has a few machine pistols, if my memory is truthful.
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- Can you figure it out?:
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