I would recommend a Beretta semi auto. I like the 390 or 391. They are pretty easy to adjust to fit to almost anyone and there is a big variety of parts and aftermarket accessories to help set it up as he wants. It will get him started until he knows exactly what he wants and hold its value if you ever decide to sell it and get something else. An over/under is nice but I think you really need to know what you want and what fits you before you get one. If it doesn't fit right, an o/u is a lot harder to change and he will feel the recoil a lot more.
