I have a 10/22 Carbine which came with Ruger's cheap birch stock. It sees pretty hard use and the stock has warped significantly around the receiver. The receiver sits flush against the stock on the left side, but there's a large gap on the right side - large enough that the rear cross pin and the buffer pin slide in and out partway when the rifle is canted side to side. There's also enough flex that, even with the takedown screw tight, the receiver can be easily pushed side to side with just a thumb, though it always returns to being flush on the left side.
I'd prefer not to buy a new stock if I don't have to, but this stock is cheap enough that I don't mind trying to fix it, even if I make it worse in the process.
Should I...
1. Shim it to make it flush on both sides? If so, shim the left side to force it right, or just shim the right side to fill in the gap?
2. Remove wood around the receiver so it can sit centered, and then add spacers to keep it centered?
3. Something else?
4. Turn it into firewood and buy a new stock?
Pictures can be found here (sorry they're not too clear): https://imgur.com/a/Nl9dpkl
Thanks!