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submachine gun 
Shoulder-held automatic assault weapon that fires handgun cartridges in bursts.
magazine 
Part containing the cartridges, which are automatically fed into the gun barrel.
magazine catch 
Device that attaches the magazine to the weapon.
barrel 
Tubular part that guides the trajectory of the projectile.
trigger guard 
Metal piece covering and protecting the trigger.
butt plate 
Back part of the weapon that is held against the shoulder.
trigger 
Device that is pressed to fire the weapon.
pistol grip 
Part for holding and aiming the weapon; its shape is similar to that of a pistol butt.
receiver 
Metal casing around the weapon’s firing mechanism.
rear sight 
Articulated graduated aiming device attached to the back of the barrel; the rear sight is lined up with the front sight when aiming.
front sight 
Metal aiming device attached to the front of the barrel.