First remove the trigger unit. Then with the bottom of the rifle held upward, gently hit the top of the butt stock against a padded surface like a slipper on a thick rug until it lifts out of the stock.

If this does not work, then put the rifle bottom upward in a rest. With a hardwood dowel or a brass punch against the inside rear of the receiver, BUT NOT THE FIRING PIN RETRACTING BRIDGE, hit the dowel or pounch with a mallet and drive it out of the stock.

 

I would echo Tommo's cautions but take things a step further.

In stripping my SuperMatch, I did what he also posted, but made sure to GRADUALLY tap out the receiver, applying more force as I went along.

You don't want to give the receiver a good slam with the mallet/dowel rig. Just tap it progressively harder until you see movement and keep tapping away with the same level of force once you see it starting to come out of the stock.

Spike