Not gonna touch your first Q, but for the revolvers... there still are some around. Tanaka and Marushin both have a pretty good line, and TM and other companies also have a few.
Generally speaking, for "players" they aren't popular options because they're neither used much by modern armies (so people don't use them to complete impressions) nor very practical, compared to magazine fed automatics.
I personally own one, which I find uniquely cool in that the 8mm BBs sit big 44mag-like shells, so it's generally realistic in terms of loading... but despite the high power and accuracy of it, 6 rounds shot in single action just doesn't cut it "in combat." I'd take my 1911 any day for that.