noun (n)

• a worker skilled in making armor or arms(noun.person)

  Example:
  A sword made by a famous English armorer.
  

  Synonym:
  armourer
  

  source: wordnet30
• an enlisted man responsible for the upkeep of small arms and machine guns etc.(noun.person)

  Synonym:
  armourer, artificer
  

  source: wordnet30
• a manufacturer of firearms(noun.group)

  source: wordnet30
• One who makes or repairs armor or arms.(noun)

  source: webster1913