A professional who repairs and modifies firearms to blueprint and customer specifications, using handtools and machines, such as grinders, planers, and millers. Responsibilities include:

• Fits action and barrel into stock and aligns parts.
• Installs parts, such as metallic or optical sights, pistol grips, recoil pads, and decorative pieces of firearms, using screws and handtools.
• Rebores barrels on boring machine to enlarge caliber of bore.
• Operates broaching machine to cut rifling in barrel of small arms.
• Installs choke device on shotguns to control shot pattern.
• Operates machine to grind and polish metal parts.
• Immerses metal parts in bluing salt bath to impart rust resistant surface and blue color to metal.
• Fires firearms with proof loads to determine strength characteristics, correct alignment, and assembly of piece.
• Fabricates wooden stock for guns according to customer specifications.
• Refinishes wooden stocks for rifles and shotguns by hand sanding and rubbing with special finishing oil and quick-drying lacquer.
• May lay out plans on paper and calculate bullet-flight arcs, sight positions, and other details to design new guns.