There is one for sale the place is called Jhonson gun works in Brownwood,TX no glass but they have the case. I have dealt with them when nobody could get sig m17 surplus and they always come thru great people.
(325)998-8976
I'm looking for a parts kit for my Sig Sauer P556 Sig Sauer SIG556 Parts Kit, Swiss Style with Short Gas System. #PKIT-556-SGS I know they have been sold out for some time if you have a part kit laying around hit me up send me and email see if we can make it happen.