Do nothing there great guns! But you could check and see if your barrels free floated then maybe check the scope base screws and make sure there tight or better yet take them out and put some blue lock tight on them. Then you could install a metal trigger guard from a marlin model 60 i think 22. Have to mod the trigger guard a little bit but not to much. And adjust the trigger to your liking.
This fourm has tons of info on the XL7
http://www.marlinowners.com/forum/ma...erfire-rifles/