There are two versions of the Gunroom archives:
The hmssurprise.org internal archives This is a somewhat crude Mailman archive, going back to very near the start of the list in October 1995. You will need to be a member of the list to visit the archive, and will have to supply your list password to view it.
Michael Trick's Gunroom archives This is an external site, which has searchable version of the archives (searchable only up to 2018). It also goes back to October 1995.