Did The Gun Change???
In one scene, Keaton takes a snubnose revolver from the barber shop, the next thing you know, he is loading a wheel gun with shells. Did anyone notice the difference?
revolver is a wheel gun. Keaton never loaded the gun. You see the back of the barbers head and hear a bump, when he turns around, there is a small short barreled revolver on the table (looks like a snub nosed S&W .38 special, barrel is 2"'s or less). You only see this two other times in the movie; when he stands up in the restaurant and the child and his grandmother see it in his waistband, and then when he takes it out before entering the critics apartment and shooting. He never loads it or checks it for shells. The revolver that we see getting loaded is a large frame S&W with a long barrel, probably a .41 or .44 with a 6-8" barrel. That is Robert Downey Jr's gun.
I am not a firearm expert so those are my best guesses, but they are two different guns.