9301.90.90.30 - Machine guns

This classification covers machine guns, which are automatic firearms designed to fire a continuous burst of ammunition from a belt or magazine. These weapons are characterized by their sustained firing capability and are typically mounted or operated by a crew. The distinction lies in their fully automatic firing mechanism and higher rate of fire compared to semi-automatic firearms.

As a leaf node within the "Other" subcategory of "Military weapons, other than revolvers, pistols and the arms of heading 9307," this classification specifically isolates machine guns. Its sibling category, 9301.90.90.90, is also classified under "Other" but encompasses all other remaining military weapons not specifically enumerated elsewhere within heading 9301, meaning it would include items like artillery pieces, mortars, or recoilless rifles, but *not* machine guns which are now specifically classified here.

Given this is a specific classification for machine guns, there are no further subcategories. Classification under 9301.90.90.30 is definitive for any firearm meeting the technical definition of a machine gun, irrespective of minor variations in design or caliber, provided it is intended for military use or is of a type primarily associated with military applications.