Establishments primarily engaged in manufacturing small firearms having a bore 30 mm. (or 1.18 inch) or less, and parts for small firearms. Also included in this industry are establishments primarily engaged in manufacturing certain weapons more than 30 mm. which are carried and employed by the individual, such as grenade launchers and heavy field machine guns. …
Examples: Barrels, gun: 30 mm. (or 1.18 inch) or less, Carbines, 30 mm. (or 1.18 inch) or less, Carts, machine gun and machine
