I don't know much about guns and even less about antique arms. A friend of mine awnts to sell me a 1892 Winchester lever action rifle. He is asking $500. The gun looks real nice and the action works smooth. He says it shoots nice (I have not shot it yet). Is this a fair price and what do I need to look at before buying it? Or should I just loan him $500 and tell him to keep the gun?