I had a 22Hornet that had a youth stock, I just added a Limbsaver slip on recoil pad to lengthen the stock for grownups. However, if i had it over again, i would have a wood stock, trim an inch, making a 13" LOP for the smallest child, and then reattach the standard recoil pad, then add a slip-on pad for adult use. An adjustable ATI I am sure would be a good solution for some added $. Good luck.