Ok, it's 1938.
We know that they have access to some foreign SMG designs all ready (don't know which ones exactly, but I'm guessing mainly German/Czech ones), and the army has a list of demands that, at best, needs to be thrown out the window if they want to have anything at all.
Having two variants, one for the Coast Guard, one for the Infantry is not doable. One model, or else this isn't a real panic weapon.
Wooden/Plastic/Leather grips are an expense that they can not particularly afford to be picky on, best they can ask for would be "Metal grips/stocks with some leather wrappings".
Select fire with "decent first round accuracy" is actually on of the easiest things to ask for.
More reliable than the STEN, ignoring the time travel issues involved, isn't exactly difficult either. I mean even other STEN's were more reliable than the Mk II.
So, what I would picture it all coming out as, would be a Bergmann system with a very minimalistic gun built around it. Leather wrapped around the forward receiver to allow a safe handhold, and a stock that would look like the M1 Carbine Paratroop collapsible stock's anorexic cousin.
Main problem is going to be the magazine (if they go with a Bergmann system, the magazine they are going to adopt is just awful anyway) and the inevitability of some dumb conscript breaking the damn things because it is sticking out the side and makes a more appealing hand hold than the forward leather wrap. However if they do decide to move the magazine to be a bottom feeder (as in feeds upwards from the bottom of the gun as opposed to the side) I could see them stumbling onto something like the Blyskawica just with a possibly shorter barrel.
We know that they have access to some foreign SMG designs all ready (don't know which ones exactly, but I'm guessing mainly German/Czech ones), and the army has a list of demands that, at best, needs to be thrown out the window if they want to have anything at all.
Having two variants, one for the Coast Guard, one for the Infantry is not doable. One model, or else this isn't a real panic weapon.
Wooden/Plastic/Leather grips are an expense that they can not particularly afford to be picky on, best they can ask for would be "Metal grips/stocks with some leather wrappings".
Select fire with "decent first round accuracy" is actually on of the easiest things to ask for.
More reliable than the STEN, ignoring the time travel issues involved, isn't exactly difficult either. I mean even other STEN's were more reliable than the Mk II.
So, what I would picture it all coming out as, would be a Bergmann system with a very minimalistic gun built around it. Leather wrapped around the forward receiver to allow a safe handhold, and a stock that would look like the M1 Carbine Paratroop collapsible stock's anorexic cousin.
Main problem is going to be the magazine (if they go with a Bergmann system, the magazine they are going to adopt is just awful anyway) and the inevitability of some dumb conscript breaking the damn things because it is sticking out the side and makes a more appealing hand hold than the forward leather wrap. However if they do decide to move the magazine to be a bottom feeder (as in feeds upwards from the bottom of the gun as opposed to the side) I could see them stumbling onto something like the Blyskawica just with a possibly shorter barrel.