So... I need help.

The stock on my .22LR rifle is "loose". Meaning that I can tap the receiver and make it rock up and down in the stock. All screws are tight but there is still play. This is very new as it was rock solid last time I was out. Not sure where to even start. I disassembled the receiver from the stock and put it back on, making sure everything was on correctly, I mean, it's not hard... but apparently something is going on.

It's a Tac-Sol x-ring receiver in a Victor Co. aftermarket stock.

So, mastersmith's: best way to fix?

Thank you.