The Wolff Gunsprings spring kit for the Ruger SP-101 is a tune-up package built to smooth out the double-action trigger pull and clean up the reset on this compact wheelgun. Wolff has been building aftermarket springs for decades, and their wire stock and tempering process gives consistent pull weights across the kit lifespan. The kit includes replacement hammer and trigger springs sized for the SP-101 action.Installation calls for a basic revolver disassembly, which most owners can handle with a bench block and a punch set. After install, double-action pull weight drops and the single-action break feels cleaner on a gun that comes from the factory stiff by design Ruger builds the SP-101 with reliability in snub-nose defensive loads as the priority, which means factory springs are biased heavy. For range and competition use, the Wolff kit brings the pull into a more shootable range without compromising hammer strike energy when matched with quality primers. Fits SP-101 models.