on the stock of my 9422 coming off of the bottom tang is a small crack. I noticed it when it was about 1/2" long. it is now about an 1" long.

The crack is thin and I cannot open it by trwisting the stock or anything. I also just noticed 2 small cracks about 1/16" starting to come off the upper tang. Is there any way of stopping these cracks, or should I just keep a close eye on them?