After I bought my p220 used in '96 I was grabbing any literature I could spot about Sigs. I read in a gun magazing that if the recoil spring has green on it then it is a model approved for plus p ammo. So naturally I looked and sure enough mine has some green (paint?) on the recoil spring. Anybody ever hear of this? I never read anything about that again. P.S. 220 is great: lite weight, accurate, totally reliable. Wonder why you don't see many at the range. In that price range people are getting "prettier" 1911's? Don't know.