Colt Series 80 Gold Cup Trophy National Match 5"
not sure about the spring, I think its 18#

I bought the gun used - previous owner put a Wilson Combat Shok-Buff Recoil System in it with a full length guide rod
he didn't remember what spring was in it. He shot hardball rounds in it - so thats why I think it has the heavy spring.
The gun came with 2 other springs, again not sure what they are and I need to find out. My guess is one is the light spring and the other the original spring. I may have to just buy a lighter spring, so I'll know what's in it - because I want to stick with lead and light loads.

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I'd like to agree with you BUT