I usually scrape old finishes off of stocks to be refinished instead of toying with chem stripper soln that usually won't do much to the modern epoxy type toppings around.
A simple sharp knife blade (I use an old jack knife w/a approx 4" blade). Hold it at a near 90* angle to the wood with your thumb right behind the blade itself. That'll prevent any chattering and with a little practice you can strip the old finish off in curls most of the time. Right down to the fresh wood, No need to go any further.
Being careful and letting the grain and feel of the scraping tell you if you need to change direction, you can get a very smooth and even job done.
The concave portions clean out just as well with a bit of lighter handling of the blade and from different angles.
It takes me about 30 to 45 min to completely strip a butt stock of SxS shotgun.
I just completed another one , one of those imports from the East with the very heavy color tinted epoxy finishes.
It's nice not having to deal with liquid strip soln's and then water rinse, discolorations, drying, etc.
Some light sanding and it's ready for my re-finish.
