The front ring has to come off before you can take the action out of the stock. There is a spring clip on the bottom of the front ring just behind the bayonet lug that has to be depressed while you gently pry or tap the ring forward and off. It will be very tight, so take your time so as not to damage the wood.
Next you will need to remove the mid-ring by the same method. Having the mid-ring off will allow you to remove the handguard on top.
The next step is to remove the two action screws on the bottom at the front and back of the triggerguard. With all this done, the action should lift out of the stock. Lift it out from the front rotating toward the rear. Because of the age and time since it was last disassembled, some coaxing may be required by gently tapping it on the lugs with a 1/4" dia. wooden dowel where the action screws were removed.
Hope this helps!