You know...its true.
SS and Carbon based steels will not give you any different performance/life span than each other.
The most common used are 4140 HT/Chromoly/High ordinance steel (carbon)...usually at around 40-44 Rc. and 416 Stainless Steel . Usually gun frames and slides, barrels and controls also....its excellent material and its finished at the same Rc as carbon.
Rc=Rockwell is a hardness rating after HT thats all....not tensile strength, handling heat cycling, heat dissapation and so on.
Hardness is hardness....44 Rc on SS is just as hard as 44 Rc on 4140. Same thing.
People say SS galls easily if used with other stainless parts. But I have to disagree. 20 years ago..maybe. Machining tolerances and methods, improved SS "cake mixes" and other factors have made this almost impossible to do......even if you shoot it dry its not likely to happen.
Some people do have a body chemisty war with SS....hi acidic levels in perspiration can react with certain "cake mixes" of SS...and oxidize the guns rather quickly. A gun with a finish will do well with these people
I have guns of Alloy, 4140, 416 and so on....the all shoot and wear perfectly.
The only place I hesitate using SS is in the trigger/action pcs. For the mere fact tool steel is easier to machine and heat treat than other carbon based or Stainless steels.
You can machine it and then heat treat it..easily and it changes very little dimensionally. Two steps and your done, with better results usually.
SS and others will grow/shrink/tweak as they are heat treated...requiring a small amount of material for "finish cutting" to make sure its just the right size. This second machining process can "work harden"= making hard/soft/inconsitancies in the part, as its "finished". Make sense?
Plus you can start with great tool steel at 20 Rc and machine it like butter and then make it TOUGH later..your done. Perfect.
Or I could be wrong.
Shoot well