Buy a single copy of the current issue of Double Gun & Single Shot Journal online
A publication dedicated to the sportsman and collector of double guns--which, if you have to ask, likely means that this isn't what you're looking for.
Here's a bit more from doublegunshop.com:
Double Guns - or double barreled shotguns are typically acquired for hunting, sport shooting & gun collecting. These two barreled shotguns can be either Side by Side (SxS) or Over and Under (O&U). American, European & British SxS shotguns or gameguns are very popular with field hunters and gun collectors, while O&U shotguns are used mostly by target shooters.
Order Double Gun & Single Shot Journal online
Buy a single copy of the current issue of Double Gun & Single Shot Journal online
You are purchasing the current issue of this magazine.