It depends on what you mean. There really is no standard. Different people choose different guns depending on personal preference.
Sorry- you will need to define "standard gun" There were several nations that all had their own "standard" gun.
High Standard
HI Standard
Most likely people have gun in there home for self defense
You will have to scour gun shops, gun shows, want ads, for sale ads, Hi Standard collectors.
A standard poodle were commonly used as water retrieval dogs and gun dogs.
The standard issue firearm is a small, lightweight gun called the P99
It is the standard .68 caliber
Standard .68
Back issues of Gun Digest, Standard Catalog of Firearms, Blue Book of Gun Values
Internet, gun show, gun shop, Blue Book of Gun Values, Standard Dictionary of Firearms
Gun shops, gun shows, appraisers, Standard Catalog of Firearms.