I was looking at some police trade-ins (Sig 226's) yesterday at a local shop. Most of them were in decent shape with normal holster wear, but I have to admit that I don't know much about Sigs, and wasn't sure what to look for. Most of them had night sights, that are probably dead or close to it, not a big deal, but I am concerned with normal wear and tear. The price was $499 for any of them. Are these pistols Energizer bunnies that keep going and going, or is there a risk of weakened slides- shot out barrels etc? Any tips on what to look for?