Gauge indicates a shotgun, not a rifle. The 8 gauge has been out of production for many years, and was a black powder shotshell. The 8 g. is not legal for hunting in the US.
Yes
Almost every country makes rifles
Sako
Are you asking about double rifles,rook rifles or bolt action.
remington
Germany and Australia
Fabrique Nationale
Any true 8ga gun is rare, and should be carefully evaluated by a competent gunsmith. Would bring at least several hundred dollars, if not over a thousand.
Diana makes Original Air RIFLES.
Remington was one.
Rossi
Sheridan air rifles who is owned by Crosman Sheridans are 5mm air rifles