For the fourth consecutive week, National Firearms Museum Director Jim Supica is featured in the Curator's Corner on NRA News.

With him tonight are a few very special guns that have a bit of an identity crisis: "A three barrel combination gun, usually two shotgun barrels and one rifle gun, is called a drilling," Supica explains.

Featured on tonight's show are a Winchester 73 lever action rifle with a 12 gauge shotgun barrel added and a Smith & Wesson Russian model revolver with a .22 barrel added. "These are custom combination guns," Supica said.

"They've always been popular in Europe and never really caught on over here," Supica said. Why? You'll have to listen to the show!

To learn more about combo guns, listen to the Curator's Corner at 10:20 p.m. on NRANews.com or on Sirius Patriot channel 144.