When I worked in the Browning gunsmithing shop we used epoxy to repair cracks, the crack was prepared and the epoxy was mixed then both the stock and the epoxy were placed under a heat lamp. This warmed the wood and spread the crack slightly while thinning the epoxy. Once the epoxy and stock were warm the epoxy was applied to the crack and back under the heat lamp. The stock was carefully observed when the epoxy was just about hard the excess was carefully scraped off. A rag with rubbing alcohol was used to wipe the surface, if done carefully the repair could be leveled with the finish and no refinish would be required.
