"Nothing beats a good Mauser at your side, kid..."
I dunno... a Japanese WWII Nambu pistol would have worked just as well all greeblied up, and would have fit into the whole WWII UK Sterling SMG/SMLE Enfield/German MG-34/Sturmgewehr 44 deal and may have lent an air of ??? due to the scarcity of the Nambu at the time...
EDIT
Nevermind, skipped past the original question and thought type of gun in general...