The 410 was part of the S&W Value Line of pistols. Not all parts interchange with their standard line of pistols. Slides, barrels and sights in the Value Line were quite different from those in the standard line.
Thanks everyone but I just found out he sold it on me. Probably for the better than dealing with someone like that. But I think i will continue to search for gen 3's
4003/4006 are plentiful on the used gun market as 40S&W is not as desirable as it used to be in the 1990s when every police dept. carried them and the public followed suit.