Replace action in stock and replace the two front stock screws and then the rear one. I usually pull the trigger when screwing in the rear screw as it can feel home but it is only in a couple of threads as it is pushing against the sear. This can cause the screw to pull out when the gun is cocked and result in a split stock. Replace the trigger adjusting screw and turn it until it just starts to move the trigger. On my gun there was something catching when I cocked and released the gun. It was one of the front stock screws catching on the cocking arm so I just filed a bit off the end of the screw.