Very reasonable way of approaching it. After all, if you intend to (or are thinking of intending to) drop serious coin on a gun, the least a seller should do is answer all your questions and be bound by their answers. None of this "I don't know nothin' about it. Figure it out yourself" that some sellers will give. (After all, if the seller don't know nothin', how did he come up with his asking price? Throwing darts at the wall?)
Compare it to buying a used car (something I did recently). The dealer was more than happy to drive the car to my mechanic for him to inspect and give me the thumbs up/down and to answer all my questions. And after my mech said OK, I felt comfortable dropping several thousand on a '96 Volvo.
