armorer

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A manufacturer of weapons, especially firearms.
• noun An enlisted person in charge of maintenance and repair of the small arms of a military unit.
• noun One that makes or repairs armor.

from The Century Dictionary.

• noun Formerly, a maker of or an expert in armor; hence, one who had the care of the arms and armor of a knight or man-at-arms, and equipped him for action.
• noun In modern use, a manufacturer or custodian of military arms; specifically, one who has the supervision of any collection or equipment of arms.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who makes or repairs armor or arms.
• noun Formerly, one who had care of the arms and armor of a knight, and who dressed him in armor.
• noun One who has the care of arms and armor, cleans or repairs them, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a manufacturer of weapons, especially of guns
• noun a military specialist in charge of the upkeep of small arms etc
• noun dated someone who makes or repairs armor

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a manufacturer of firearms
• noun an enlisted man responsible for the upkeep of small arms and machine guns etc.
• noun a worker skilled in making armor or arms