Here are a couple of other options you might want to consider. Knight is one of the best ML's out there and they have a Wolverine youth model.

http://www.knightrifles.com/productDetail.aspx?id=326752

Also NEF makes the SideKick which is not a youth gun, but it only weighs 61/2 lbs. If he can handle the length of pull, it would be a good option for the money.

http://www.hr1871.com/firearms/index.php?cat=1&subcat=34