It's highly debatable, and it depends on the time era as well as the place.
For example, the so called "Wild West" era in Western United States during the 1800s had one gun as the best rifle: The Winchester repeater.
Capable of holding 15 rounds with a tube loading system, it was known as the "gun that won the west". Its sheer quantity of ammunition and solid accuracy made it a favorite of Americans n the West.
Modern Era (after world war II)
By sheer performance, there is no best gun in history. Period.
There's just too many variables such as the gun parts, military situation, reliability, durability, accuracy, firepower, cost effectiveness, etc.
For example, the AK-47 is considered the best gun in history for rugged durability and cheap cost. Cost effective wise, the ak was one of the best guns in history.
On the other hand, we also had guns like the FN Scar, but while they are one of the most accurate and effective guns in history they are also VERY EXPENSIVE.
Basically, everything depends on the situation you're talking about.
Impossible to answer without knowing what you mean by "gun men"
Remington 870. Nine million plus
Depends on the gun, and exactly what history you are looking for. Please repost with some information on the make and ype of gun, and what history you are seeking. If it is who owned the gun before you, that is NOT available.
The one who never made the history books and died of old age
It depends on what condition the gun is in,markings on the gun,and what the history of the gun is.
Some makers offer history letters.
No published history
The cast of History of the Gun - 2012 includes: Lawrence Larkin as Michael
No published history. Try BLue Book of Gun Values and old gun catalogs
The best gun in gta lcs is the m60
no the m1garand <><><> There is no ONE "Best" gun.
No published history of the company