I always thought gravity feed guns were a more recent development, last 25 years or so. Last night I was watching a documentary on the German WW2 Panzer 4 heavy tank and it showed a guy in the factory spraying away with one. It didn't seem to be leaving a big cloud either though all that was shown was a quick shot. So did they have them over here during that period or was our production stuff all siphon? When I was a kid all I recall ever hanging around my fathers shop was strictly siphons like the Binks 7.