This is a Beretta ASE 90 that suffered a broken buttstock through the webs where the hand joins what would normally be called the head. In this gun, the stock is very thin in this area because of the added frame width, necessitated by the detachable trigger unit. It appears to have suffered a side load applied to the stock, sufficient to crack the wood. How it happened, exactly, I do not know but the grain structure in the area didn't help matters any. There are some that think grain flow doesn't matter in a drawbolt application, they are mistaken.
After chipping the loosened synthetic finish from the broken areas, the separated parts were prepped for reattachment to make certain that the repair would be as invisible as possible. Once all was back in one piece, I machined it internally to accept ply and carbon reinforcements. After that, the inletting was recut, the repaired area was refinished and blended, and finally, the checkering was recut.