it doesn't really matter if the part numbers get posted openly or not since when you call S&W customer service, they only allow you to order "certain" parts. and even this privilege varies by who answers your phone call...some individuals take the order very helpfully without comment and others just say it is not available for sale as a service item and the WHOLE rifle has to be sent in to get the one part.

i had some two year old magazines that had the springs get weak and would not consistantly actuate the bolt stop after the last shot. S&W wouldn't sell me the new springs, but they did allow me to return all the magazines with weak springs and replaced them with brand new magazines at their cost. nice, but turn-around time was two weeks...fortuantely i had a lot of other magazines.