Ive owned, shot and seen too many semi autos from various manufacturers (S&W,Colt,Springfield) where the stainless construction has been an issue. It obviously varies from manufacturer and depends on the steel they are using and how they treat and machine it, but Ive seen far too much galling, peening and even cracking in stainless. I much prefer carbon steel with a good protective finish. Ive never personally handled a stainless Wilson (although Im more than happy with my steel Wilson), so I cant vouch for the effects of long term shooting on their stainless guns. Strangely enough this doesnt seem to occur with the various aftermarket barrels and internals from quality manufacturers from what Ive seen. Ive had nothing but good luck with stainless match barrels, hammers, sears etc. I dont have enough knowledge in metalurgy to offer an explaination.
BTW...thats not me in the avatar...Go rent Taxi Driver.