New guy here with some observations
New here but this thread was helpful regarding the Magpul Hunter X22 stock.
I just acquired my first 10/22 (tactical model) that came preinstalled from the PO in the X22. It also came to me filthy although shot very little.
What I found worked best instead of adding duct tape or some other material at the rear, which only serves to raise the tip of the barrel so that it doesn't contact the forend rib, thereby free floating it and introducing potential issues contrary to Rugers design (depending on model), was to take down the bedding block area at the screw mount just a bit as it sits proud and causes that rear receiver slop. After removing the reversible barrel guide, I used a sharp chisel perpendicular to work the outer ribs lower, then smooth the area by scraping with the chisel perpendicular to the receiver retaining screw boss. Careful you don't take too much material off and check the fit often.
I have yet to get it to the range to test this theory, but will try to ETA if I do anytime soon.