I'm looking for a good deer rifle for my son. Not quite a teen. Not a large build, but pretty strong for his size. Obviously, safety and accuracy are more important than take-down power. Any reccomendations? I personally deer hunt with a Rock River AR15, and my wife uses our 12ga. The AR is a little too heavy for him (long barrel version). Would the shorter barrel version be OK (I could even take the 12ga. and just get a different upper for him to use), or should I look elsewhere? Thanks!