This is a common problem with all M219 & M220 stocks. Where the stock meets the action is a weak point. I suggest using fiberglass to make the repairs as opposed to a glue. Also, add a very thin coat of the fiberglass to the inside of the wood where it meets the action for added strength. Before I would shoot one of these models that did not already have cracks, I would glass bed as a precaution. I don't really think adding a recoil pad would help. I have one M220 shotgun that was custom stocked by someone else and they left the wood at the action point much thicker than the factory stock. I have a picture of this stock on page 94 of my book showing the thicker stock. Good luck with your repairs!
Update, 12-12-16....Since responding to this I purchased a M220 action and stock only. The stock was badly cracked and an even worse repair had been done to it. Who ever made the repair (I think his name is Bubba) not only did a poor job of gluing the crack, but also installed a large flat head wood screw vertically from the bottom of the stock. This repair had come loose. I removed all the old glue and the screw. Re glued with Epoxy and as above, spread a thin layer on the inside of both walls. Then after I filled the large hole where the wood screw was with walnut dust and Epoxy, I carefully drilled a small hole vertically from the bottom and glued in place a slightly smaller (than the new hole) steel pin. I then covered the head of the pin with walnut dust and Epoxy, sanded to match the contour of the stock and it is hardly noticeable. I suggest again, that anyone who installs a semi-inleted stock to one of these actions that you leave the wood much thicker at the stock/action contact point.
