(stitches sides back together . . .)
I have an adjustable gas-thru T-stock on a remote set-up automag. It's pretty good as you can change the length and it just screws into the ASA.
Not sure what the set-up on a Tippy is like (not fired one personally, but seen plenty in action through the years) but they seem quite a long marker, so a fairly short stock, or one that can "collapse" to a fairly short length would probably be best.