I recently purchased a like new 4506 with two mags. One mag appears to have been changed per a recall that affected these mags back in the early 90's. It has a punch mark and "2" etched next to it near the floor plate. It also has a yellow follower with a warning etched on the side to "use only yellow followers". The other mag does not have any markings except the usual S&W logo and "45 cal" on the side. I have read the recall on various forums and web sites. Anyone have any experience with this issue? Can't get through to S&W since they are out until 4 Jan, but I've read that the recall is so old that S&W doesn't remember it.