As mentioned above, I had the same problem of getting the action out. I have done more than a few teardowns, and this was a first ever, likely related to the mismatched serial numbers. As your gun looks like something like the cabelas chinese sks (but matching numbers, nice), perhaps my experience can help you.
In my case, the cross bolt, which has a flat facing the rear of the stock, was not allowing the front of the action to raise. I saw this later when trying to get the action back in.
When pushing on the "button" release behind the trigger guard, it wouldn't break free, no matter how hard it was pounded.
If I were to do it again, I would force the action all the way to the rear of the gun (one way is with a big clamp, clamping the butt-stock end on one end and the muzzle of the barrel) to pull the mating point on the action off of the cross bolt flat, and then press the trigger guard button. And pry, but only if necessary.
If it stays tightly bound together like it is now, perhaps the gun will be very accurate, as one source of play is eliminated.