You need one MP 40 per squad. I'm sure whoever asked for these probably has farb squads with everyone carrying them, though.
Well I have an unarmed Japanese guy and since nobody makes Ariskas or type 100s I guess I'll sacrifice historical accuracy for old timey war movie stuff. I have an Afro German lieutenant who came with nothing but a hat and a holster (the useless black bastard) and a bunch of guys are armed with Berettas, which are cool actually but it took me ages to figure out what the hell they are and I'd rather just let the Afrika Korp guys keep those. The Hasbro MP40s that came with the Indiana Jones toys suck balls. I don't have many Strumgewehrs either. It'd be nice if I could find some Gewehr 41 or 43s. There is also a scale discrepancy between the 21st century mausers and the Unimax mausers (I think the Unimax ones are too small). I don't think any scoped rifles were ever made at that scale either. So yeah, I'm just going to deck out my Afro-German combat unit with MP40s.