I did not take into account the differences between the m1928 and the M1a1, my bad. However, something else dawned on me after I wrote that. The Sten and MP40 both used 9mm while the Thompson( both models) used the heavier .45 and the PPSH used a cut down 7.62 round. This would mean in a suply situation German and English forces could use each others ammo, not so for Russian or American forces. However in A Bridge Too Far, several English Paras can be seen using MP 40's In Arnhaim after they were cut off and low on ammo. Is this Hollywood hukom, or did the paras prefer the German weapon?

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"Goddam it, you'll never get the Purple Heart hiding in a foxhole! Follow me!" Captain Henry P. Jim Crow