What exactly are you trying to ask?
There are four basic positions: Standing, kneeling, sitting and prone.
Firing position.
emplacement
There are four generally recognized positions for shooting; standing, sitting, kneeling and prone. As a very general rule, you will perceive recoil less when standing.
it really depends on the type of gun. a large artillery piece would be located well to the rear of a battlefield. But, a machine gun would want a clear field of fire with good cover.....and close to enemy lines
To cock a gun means to load it sort of. Like, when you hear guns go like -chk chk-. When you cock a gun, you are placing the hammer in a position to fire the weapon.
Its a gun.
Gun
gun grenade gatling gun
it is a weapon, an machine gun
Weapon.
You did not list a weapon.