I am not a fan of superglue for repairing stock cracks... It is strong but not very shock resistant.
I drill a tiny hole at the end of the crack and heat the wood thoroughly. Apply a small bead of slow-curing epoxy along the crack including the bare wood on the inletting and cover with saran wrap. The cooling wood will create a vacuum and suck the epoxy in deep.
Clean-up is easy with a sharp knife.
art
Sitka Deer, with all deference to your experience, I don't think short of dropping the .22 lever rifle hard on the butt that there's much need for shock( recoil) resistance.
I'd still try the superglue fix and regulating the ambient where the rifle is stored first..One can always go to more extensive efforts afterwards if that doesn't work.
Best regards, Jim
