[Archie]

During WWII Germany packed a double gun, rifle/shotgun combination, into many of the larger military aircraft as survival guns. The idea being a stranded crew could forage for small or medium game or birds until they were rescued or walked out.

There is a problem with the two caliber guns in the United States for hunting. At least in People's Democratic Socialist Republic California, one is in violation of the game laws if one has a usable rifle while hunting birds. So a 20 guage/22lr combination with one round of 22 lr in one's pocket is a serious violation - as in seizure of the gun and a fine. This may be true in other states as well.

Still, the old style zwilings and drilings are really classy guns.