obsolete

adjective
adjective: obsolete

1.
no longer produced or used; out of date.
"the disposal of old and obsolete machinery"
synonyms: outdated, out of date, outmoded, old-fashioned, dmod, pass, out of fashion;

Yes, the 16 gauge is obviously obsolete. Nobody makes guns or shells in 16 gauge anymore. Any shells you find are likely to be duds that won't fire. Anyone who has a 16 gauge double is in "double trouble", no pun intended, because we all know that doubles are pretty much obsolete too. The best thing to do is to sell them quick, for any offer you can get for them. If you hang on to them much longer, you will probably have to pay to have them disposed of.

Voting for anti-gun Democrats is dumber than giving treats to a dog that shits on a Persian Rug