Gunny,
IMO, most of the strippers available at common hardware stores have gotten weak over the years. The "15 minute" stripper at HomeD will do a Browning/Beretta plastic finish in about 3/4 of a day of messing with it and multiple applications.
But, if you're serious, you'll be more satisfied by going to an aircraft supply house like Aircraft Spruce and getting a stripper made for polys/epoxies. Besides, it's only 10 bucks compared to Brownell's 30 buck stripper.
http://www.aircraftspruce.com/