Agree with LeFusil. If the gun's not collectible, and especially if he's going to use it for quail or other mostly short range shooting, just open the chokes. I have a NID 20ga Field Grade, pretty nice shape, marked 2 and 4 (M/F). Previous owner opened it to C/M. If I were a 100% original only guy, I suppose that would bother me. But I'm not, and while the gun is nice, it's certainly not nice enough to be collectible. And I prefer the chokes as they are to what the factory provided.