Post photo's of the cracks.
Hence the cracks can be repaired to a degree, but you need to use through Pins to hold the cracks together even with an adhesive to prevent the cracks from re-cracking again.
To add, before even going that far, depending on the rifle, most of the time you can pick up a used stock set on the cheap that is not cracked isntead (marred finish). Here, a quick strip, some steaming to raise the dents, and a little staining if needed, is all that is needed before you final sand and add the finish coats.