your shop guy is a moron
.(kidding) just because a gun hasnt been made in 15 years isint a big deal. do a google search on your particular model and start there. no reason to give up on a gun that shoots good and is special or has history to it. check some of the web sites like ebay,gun broker, gun parts,. heck even give mossberg a call. i bet you could find one . what model is it?
http://www.gunstocksinc.com/ http://www.boydsgunstocks.com/crossref1.htm http://www.gunbroker.com/ http://www.e-gunparts.com/dept.asp