You can name it anything you want and there are no rules.
It is more properly called engraving or embellishment.
It is properly called a gun carriage. You may see the term caisson or limber, but those do not support the gun- they were used to tow the gun carriage.
Gun Grut's birth name is Gun Hagberg.
what is the name of the gun on a tank
Gun Andersson's birth name is Gun Britt Ingrid Andersson.
Try different ammunition, verify the shotgun is put together properly.
Take a steady aim.
They have to show that it is has been tested and is functioning properly.
A 50 caliber gun, or more properly, a .50 caliber gun is a firearm having an internal bore diameter of 1/2 or .50 of an inch.
Elephant gun.
The Parrott gun, or, properly, the Parrott rifle, is a muzzleloading rifled cannon used in the American Civil War. The gun is named for it's inventor, Robert Parker Parrott.
Frank Gun's birth name is Juhasz Fergnace.