For a non-toxic, non-fumes, non-numb fingers application, try Castrol Super Clean. I use it to remove Krylon primer and Krylon Triple Thick Glaze. Remember that this will remove all oils etc from whatever metal part you put it on. Let it soak overnight and using a cold water rinse and a toothbrush, it will remove the paint.
While i am new to the AR scene, I have been painting miniatures for many years (paid for my 1st AR with miniature sales
) and I use the Castrol stuff for all my stripping needs. I takes primers, enamels, acrylics, and laquers off nicely. I used to use acetone but I started loosing the feeling in my finger tips for a day or so after using it so I looked for other means. The best stripper used to be Lemon Pine Sol until they changed to the "dirt dont float" formula and runied it. With all things, test on a small area 1st before you do the whole thing.