Hee, Hee, Hee.
Now most folk would be postin out there on the Precussion, or the Flintlock, or even the General Forum asking what kind of Muzzleloader they should buy for their kid, but the bug has bit!
Once a person has built a muzzleloader and had it come out better than anything a factory makes, it is hard to just "buy" a finished gun.
For those who don't know, Spot Shooter never had any idea how enjoyable building a gun can be until RollingB talked him into making a Lyman GPR.
Both RollingB and I warned him about the "bug", but he went ahead and ordered the kit.
He had more questions than a backwoodsman on his first night in Reno, but his kit turned out great.
Spot, a lot of people are looking at modifying the CVA Bobcat for youngens. Another thought might be a CVA StLouis Hawken.
They are fairly low cost and can give you the fun of building another rifle.
I would suggest that if you go with either of these ideas, resist the urge to cut the length of pull all of the way down to fit your son. Leave it about 1/2 to 1 inch longer than the length that he needs now.
Kids grow like weeds and you won't want him outgrowing his new gun before it's finished. :: :: :: :crackup: You know what I mean.