Most people when the time comes to replace recoil springs just replace the outer spring anyhow.
The less you remove that captive nut on the end the better. And remember the loc tite and check it periodically.
I've no experience with the Wolff guide rod system but it sounds like a good thing.
Kahrs springs are made by Wolff so it's all still in the family.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."