This means that you'll be able to search for NAICS codes directly (if that's your jam). We'll do the math; let's make better data on public procurement together.
Guns, through 30 mm
Machine guns; Brushes, Machine Gun and Pistol.
Possible NAICS Codes
332994 – Small Arms, Ordnance, and Ordnance Accessories Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
332992 – Small Arms Ammunition Manufacturing
336992 – Military Armored Vehicle, Tank, and Tank Component Manufacturing
334419 – Other Electronic Component Manufacturing