A professional who tends swage machine that chokes (reduces) inside diameter of muzzle end of shotgun barrel to enable pellets or shot to concentrate when gun is fired. Respnsibilities include:

• Inserts and clamps shotgun barrel into holding device and starts machine that exerts contraction pressure on end of barrel to reduce inside diameter of barrel.
• Measures diameter of barrel bore, using dial gauge to verify that choke of barrel meets specification.