Why not add a boss system? I know people have mixed fealings, but i love ours. We have a .300 win mag w/ the boss system. I have been able to shoot it since I could reach the trigger, (about the age of 10!). I also have been able to handle the bigger caliber guns and shotguns. I hunted with my 12g. as young as 12.

Good luck with the gun. It is up to the kid. let him shoot it once, and see what he thinks.

Also the one thing to be careful of is the weight of the gun. I know I would have had a hell of a time packing that gun around on the hikes I took when I was younger.

Also what would your son be hunting with the gun? It is a little too big for deer, and about perfect for elk sized animals.