Hi Hector,
I have to say that the title of your kit does sound funny. But on the other hand everything went wrong for the German Wehrmacht after the end of 1943. Due to the fact that the German supply lines were wholly disrupted by the Russians, and the availability of arms and ammunition in this late stage of the war, the Germans often used Russian weapons. The submachine gun you refer to is the Ppsh 41 with a 70 round drum magazine. It fires a 7,62 X 25 mm M43 round, which is also fired by the TT-33 Tokarev semi-automatic pistol. The round is a bottleneck round and has a very high velocity. Due to the small calibre it has no recoil and could be fired quite accurately in automatic mode. The velocity is such that it can penetrate all known body armour during that era and most modern body armour.
With regard to the uniform, all German uniforms after 1943 were field grey in colour. The material used later in the war tended to fade easier than the earlier makes. This was due to the fact that Germany started running out of resources including dyes and they had to improvise.
It is also known that German POW's on the Eastern Front were given the choice of either fighting against their comrades and maybe surviving the war or perish in a POW camp. The situation at this stage of the war, for ordinary soldiers were so bad that quite a number took that option. The Russians did everything in their power to "liberate" the "Motherland" from the German Invader.
Greetings