revolver
Pistol with a rotary magazine, which usually contains six cartridge chambers.
barrel 
Tubular part that guides the trajectory of the projectile.
hammer 
Part that triggers the shot by striking the firing pin, which in turn strikes the cartridge primer causing the powder charge to explode.
butt 
The bottom part of the gun that is used to hold and aim it.
trigger 
Device that is pressed to fire the weapon.
trigger guard 
Metal piece covering and protecting the trigger.
cylinder 
Cylindrical rotary magazine that contains the cartridges.
muzzle 
Opening through which the projectile leaves the barrel.
front sight 
Metal aiming device attached to the front of the barrel.