Check out these old archived films from 1941.
Here is a training film on how to use the small arms firearms of the time. There is a good list of guns they show. M1911, M1903, M1, BAR M1918, Thompson M1928 as well as some aircraft machine guns.
They do seem to break a few Firearm Safety rules, like checking the safety by pulling the trigger. Aside from that, it is very interesting watching how the Military presented this information.
Here is another film about the safe handling and storage of ammunition.