In the past I have stripped antique furniture and as with a gun stock some areas can be tough to get into & get the old material out of. A product that I found that works really well is a spray paint remover from NAPA Auto Parts. I spray it on, let it set & use the appropriate item to remove the old finish. Old toothbrushes work well for this.
__________________ “If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams