A pal has offered me his late father's S&W 9MM automatic. I know it is a fairly early gun. His father is gone now more than 15 years. I don't know the model, so this is not a good way to start, but I am wondering if there are any inherent flaws in these guns? Something to look for? I won't be able to see it until this coming weekend, and I would buy it to use, so I want something reliable and reasonably accurate.