well,way back when , your only 2 options from colt were blue and nickel- my nickel series 70 is as fresh as the day it left the factory- and it's seen a lot of rounds- it REALLY depends on who does the job, just like everything else- and as long as you stick to the regular gun cleaning stuff,( not some home made witch's brew) there's no problem- but in today's market, there's only one option in my opinion- STAINLESS- just back in the day it suffered from "galling" which they've overcome