Originally posted by Dot_mdb:
I bought some used mags with the yellow followers and replaced them with the blue because they were beat up a bit. If they work, and they probably will, you are good to go. Otherwise you can get the blue ones from S&W for a reasonable cost.
Take your mags apart and check the springs and the locking tabs. If those parts are rusted you might want to replace them at the same time.
Bill