In the couple of weeks, I've replaced springs in both my Saiga S-308 and Ruger GP100 with Wolff springs. The Saiga got a new +15% recoil spring and just this evening the GP100 got a new reduced power hammer spring and trigger return spring. My fingers are still half numb from the effort of getting everything back into place on that revolver. I'm a little wary about whether I was able to get it reassembled correctly, but the cylinder locks up and the transfer bar works fine, so it shouldn't be too big of a problem if it's wrong. It already exhibits a much lighter trigger pull in double action. Unfortunately, the lighter pull makes the grittiness just that much more apparent. I still need to function test to make sure I'm not going to get light strikes.
The Saiga was a breeze to change out in comparison. It actually uses the same recoil spring as a standard AK rifle even though it's a 7.62x51. I was able to figure out how to go about removing the old spring and replacing it with just a moment's study. The simplicity of the AK design becomes more impressive to me each time I do new-to-me work on the rifle. I'm hoping the extra power spring will help to clear up some of the malfunctions I've had with it in the past. We'll see.
But no matter the outcome of my experimenting, the springs were well-fitted and of excellent quality, as usual. I highly recommend Wolff gunsprings.