My favorite gun was the Colt 45 pistol. This was the AK-47 of hand guns. Funny enough the Colt 45 was the the standard issue sidearm of the USArmy from 1911 to 1984. It saw little changes over this time frame. Great gun and I think it looks cool too.
COLT 45
The Americans did produce alot of effective guns during WW2. My 2nd favorite American gun was the Thompson sub machine gun. Mean weapon, a bit heavy and expensive to make, but had great stopping power. Plus it was a favorite of the gangsters as well