The stocks are the same for rimfire and centerfire.
Use a philips screwdriver to take the buttpad off.
Use a 9/16 socket and a long extension to take the stock off.
Use a philips screwdriver to take the forearm off.
Change the stocks.
Put the screws and bolt back where they came from.
Tighten everything up.
You're done.
Simple as that.
Spanky