I've never handled a revolver before but would like to purchase one. Unfortunately I only know one person whom shoots and he's a Glock fan so I come to you fine folks with my queries. When looking over a revolver for the first time, at a shop or show, are there any signs of damage that should send up a red flag? Y'know, other than something obvious like a cracked frame. On the opposite hand what indicates a good used revolver that has been well taken care of?