Questor brings up a good point, check the barrel out really well. Sillywet shooters tend to shoot a lot and the barrel could be pretty worn, but could is the operative word. Since he's a friend, ask him how much he shot it, and ask to shoot it and see how it groups. Group size growth is usually the first sign of a "shot-out" barrel. Again, depending on what it started as (factory, stainless, AA, custom) how much he shot it and what he shot (cast bullets, FMJ, hot loads, etc) will determine how many is too many. Barrel could be worthless (or make a nice tent peg) or it could be just fine. You didn't say what caliber the barrel is and that can make a difference on life also.
Helicopter Bill