edit: I just browsed them on UNcompany, i.m.o it looks like the quality is much better than Tanaka.
(dunno why Tanaka got this reputation, internals are crap and outer finish is just o-k)
CO2 is a good idea, it's probably tougher than a propane pistol, and will have a better grouping at the same distance.
revolvers are super fun to game, the problem with them is that internals have to support the efforts of the double action, so if you game them you risk breaking a part, and then you need a replacements, usually hard to come by.
my 2 cents.
damn.now I want one.
UNcompany sells a jet loader for them
can you feel the temptation?