All excellent tips. One last thing: take a strong flashlight with you. Shine it on the cylinder arm and make sure there are no cracks on the metal. Revolvers are very strong but every so often, someone decides to run +P loads just for the heck of it and you'll never know how many were fired. Also shine that light through all of the cylinder holes to make sure they're not cracked. I've never heard of a revolver ka-booming but I'm sure it wouldn't be a pretty sight.
Bumper sticker seen on back of pickup: "Fear not my gun but the hole it makes!"