Check the frame for cracks where the dust cover meets the rails and around the slide stop pin hole. Look for excessive wear and a lack of anodizing on the frame rails. Look for gouging of the frame feed ramp. $475 sounds like a good price, unless the gun is excessively worn. Aluminum frame 1911 pattern guns have a reputation for lasting 15,000 to 30,000 rounds, some go longer, some don't. I think Kimber puts a 20,000 round warranty on their aluminum frames.