Madcratebuilder, what's that last revolver you posted? The one with all the ... widgets... hanging off of it.
That is a LeMat revolver, Cavalry model. Favored by Confederate officers during the war of Northern aggression. It is a 9 round 44 cal cap and ball with a 18ga (approx)under barrel. I'm working up shot and round ball loads for the 18ga, rough job but I'll preserver. Made by Pietta, I rate it a B+ in fit and finish, it does have it's quirks.
The open top, closed top debate. I like them both. Many considered this the most powerfull revolver till the 357 came along. The Colt Walker can load 55gr of holy black and a 44 cal conical bullet.
One of my nicest Remingtons is this NMA in nickle, made in 79 and marketed by Navy Arms. I believe it was made by Sile Co. but not sure about that. It is a very accurate revolver.
This revolver is this Rogers&Spencer 1865 model. Another revolver used by Confederate soldiers. This 1979 one was made by Armi San Paolo. Nice shooter, but I find the hammer spur sets high and is hard to cock single handed. Unusual taper at the bottom of the grip.
My favorite, best feeling, I'm a gunslinger, revolver is this 51 Colt Navy. A 36 cal, it has such a natural aim to it I don't get with any others. I have read that this was bill hickcocks favorite pistol. This one was made in 64 by Uberti and is an A+ revolver in fit and finish.