armorer

noun

1. (US)A manufacturer of weapons, especially of guns.
2. (US)A military specialist in charge of the upkeep of small arms etc.

   “The squadron ground crews and armourers set high standards.”

   “Hannah Gutierrez-Reed, who was in charge of weapons on set as the movie’s armorer and who was also charged with involuntary manslaughter, also had that responsibility, the prosecutors said, as did Dave Halls, the first assistant director, who reached a plea agreement.”

3. (US, historical)Someone who makes or repairs armor.