What to look for in a used Pietta 1858?

I'll be taking a look at a used Pietta 1858 tomorrow afternoon. Aside from bore condition(and overall condition for that matter) what do i need to pay particular attention to with these revolvers?

The seller state he bought it on a whim, and fired 20 rounds through it. It also comes with a ton of other stuff(pound of Pyrodex P, powder measure, flask, round ball, percussion caps, leather flap holster, etc.)

I would also like to know the general price range for this package, if possible!

Thanks in advance!

Thanks all - I'll bring my bore light, and the "drag test" is great info! I hadn't thought about the lockup timing, either. He's asking $200, which seems to be right in line for all the "stuff" included, as long as the condition is good.

Thanks again for all of the assistance. I now own a Pietta steel frame 1858! I took the cylinder out(a bit of a learning curve, but I figured it out), and ran a brush with CLP followed by a dry patch through. It came out oily, but still white!

Cylinder lockup was good, overall condition was very good, and the extra accessories sealed the deal for me.

Also - the seller gave me a piece of paper with this link on it: http: http://www.thehighroad.org/showthread.php?t=223515//, stating that's where he learned how to use it!