What is a single barrel 20 gauge shotgun?

Answer 1

I'm not sure what you want to know. A "shotgun" is a long-barreled firearm that fires many small pellets instead of one solid bullet; "20 gauge" is the diameter of the barrel; and "single barrel" simply means it has only one. Do you perhaps want to know what it would be used for? It would be used to hunt small animals and birds or to protect the henhouse from preditors. Or do you want to know what it is worth? There are a few models made by Winchester, Ithaca, or other top-line manufacturers that have a collector value but the majority are utility guns worth from $25 for a broken piece of rust to $150 for one in excellent condition.