Given the relative ease in designing and producing submachineguns with even basic limited resources of the sort found in a modest machine shop or even a high school shop class I would venture to guess that just about every organized government and would be government would producing some sort of SMG.
One thing that might be popular would be adopting styling gives the resulting weapons some degree of visual resemblance to standard issue weapons -- CivGov and MilGov, for instance, might opt for something that sports an M16 lookalike carry handle. (If either government has an arsenal facility with spare AR parts laying around they might find it simply useful to use parts like pistol grips, stocks, hand grips and such for convenience's sake.)
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