Well, this is sure all over the map.
Maybe the OP could clarify something. Is he thinking about a practical hunting rifle, in a practical easy to get caliber, to be readily used for hunting by the grandchildren?
Or, is he looking for something rare and collectible, that would perhaps greatly appreciate in value, that they would keep over the mantle or in the safe and hug once in a while? And maybe just maybe carry into the woods once or twice, praying that they don't drop, dent or ding it?