[@Lady Selune]

B1. It is basically a war souvenir. Lugers were quite popular as souvernir by the Allies, and wouldn't it be practical to use an enemy weapon while working behind the lines? It is easier to get ammunition for a German pistol in German-occupied France.

B2. How about a carbine, then?

B3. Backpack is quite handy, and it is quite nice to eat.

Of course, I will and can change the details according to your feedback.