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Measure the diameter of the buffer tube, and compare to milspec & commercial tubes.
I know on the blackhawk stocks, they had a propitiatory stock & tube.
One more question, I can't tell from the picture, is there a castle nut on the tube?
If there is , you should have any problem replacing it with another collapsible stock.
Okay, had a look at the ATI, and from what I've seen it should be doable, the lever for adjusting the length, instead of pressing it ,pull it down and slide the stock off just like any other, should be easy.
You will have to figure out if the tube is civiy or mil spec, and get the right size replacement stock.
Mil spec diameter is approximately 1.15" , and general have a flat back.
Civiy tubes are slightly bigger, at approximately 1.17" and usually have slanted backs.
You can use a civiy stock on a mil spec tube but it will be loose, you can't use a mil spec stock on civiy tube.
Okay, maybe this might help, on the Exchange of Hunting and Sporting Arms , Huntsman, has a Mossberg 464 with a magpul stock on it for sale, drop him a p.m. ask whats need to be done.