armourer       
noun [ C ] UK (US armorer) uk/ˈɑː.mə.rər/ us/ˈɑːr.mɚ.ɚ/
 (制造、维修和供应武器的)军械士
a person who makes, repairs, and supplies weapons
  A skilled armourer can reactivate a deactivated submachine gun of this type in as little as two hours.
 - More examples
 - The explosion killed two ground crew, an armourer and an engine fitter.
 - The incendiaries scattered over the airfield had to be picked up and made safe by armourers.
 - The equipment and methods used by armourers in the past were not the same as those of ordinary blacksmiths.
 - The armourer on the set was questioned after the fatal accident.