9305.91 - Of military weapons of heading 9301:

This HTS category, 9305.91, specifically covers parts and accessories for military weapons classified under heading 9301. This includes components and attachments designed for use with military firearms such as rifles, machine guns, and other weapons of war. The key differentiator for this subcategory is its exclusive focus on military-grade weaponry, as opposed to sporting firearms or other types of arms.

Within the broader category of "Parts and accessories of articles of headings 9301 to 9304," 9305.91 is distinct from its sibling category, 9305.99, which encompasses parts and accessories for other arms not specifically covered by 9301. Therefore, items classified here must be demonstrably intended for or originating from military weapons.

This classification is further subdivided to provide more granular detail. Subcategories include specific breakdowns for parts of rifles (9305.91.10.00) and shotguns (9305.91.20.00), acknowledging common military firearm types. The remaining items that do not fit these specific subheadings are then captured under "Other" (9305.91.30), ensuring comprehensive coverage of all military weapon parts and accessories.