Hi, bstnpunk, and welcome to the Eastwood Web Board. That's a question that comes up often, so I'm going to quote a previoius post of mine:
The large revolver carried by Preacher is a Remington New Model Army ... a .44 cal. percussion revolver that was in production from 1863 to 1875. This is the gun that he reloads (after dispatching Stockburn's deputies) by replacing the cylinder, in order to fire six shots into Stockburn (Russell). He also carries a smaller revolver, which I've never been able to identify, and that is the gun with which he gives Stockburn the coup de grace, firing at his forehead.

According to the next response in that thread, by "1858Rem," the smaller gun is also a Remington ... A modified 1858 Remington Pocket Revolver. The pictures he posted are said to be of Eastwood's actual rig in the film.
Yes the fine '58 Remington(converted) and a modified 1858 Rem Pocket Revolver.


There's more discussion in that thread, if you're interested ...
http://www.clinteastwood.org/forums/index.php?board=7;action=display;threadid=1622By the way, for future reference, questions like this usually go in the Questions and Answers forum ... or you might have posted this one in the Westerns forum. Also, it's better to use a slightly more descriptive thread title than "Clint's guns," if you can!
