Most used guns will have very little wear. Most shooters don't really shoot that much and any part that breaks should be relatively easy to fix. I have bought many used guns the only ones that have ever had problems were over 40 years old.

The nice thing about is used guns is that they don't really loose value. If you go buy a new gun it will drop in value with one box of bullets through it. A quality used gun bought at a reasonable price shouldn't drop in value.