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.
Modification of Equipment: Weapons
Possible NAICS Codes
332813 – Electroplating, Plating, Polishing, Anodizing, and Coloring
332811 – Metal Heat Treating
332994 – Small Arms, Ordnance, and Ordnance Accessories Manufacturing
811310 – Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance
541330 – Engineering Services