Do a lot of people buy used guns? I've only bought 1 gun in my life and that was like 20 years ago...it was from a friend and a cop buddy checked it out for me and said it was clean. My cop buddy is no longer on the force. I'm wondering what would be the legal implications of buying a gun from someone....aside from the obvious ones that I'm now responsible for keeping it out of the hands of criminals. What if the gun in question has been used in the commission of a crime? How can one protect themselves from this?? Are there any legal requirements to "register" the gun with the local authorities after it's purchased? Is there some sort of waiting period like there is with buying a new gun?? Since I don't know much about guns, how can I tell if it's a good deal or not? I would hate to buy an old worn out gun that falls apart on me. Any suggestions on where to find my state specific information? I live in Oklahoma by the way. Any help would be appreciated.