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, over 30 mm up to 75 mm
Breech Mechanisms; Mounts Grenade Launchers for Integral-Cartridge Grenades, Single-Shot or Auto-Loading or Automatic-Firing.
Possible NAICS Codes
332994 – Small Arms, Ordnance, and Ordnance Accessories Manufacturing
334412 – Bare Printed Circuit Board Manufacturing
332710 – Machine Shops
332992 – Small Arms Ammunition Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing