Museum and historical collections
- Royal Armouries collection
A searchable national museum catalogue covering arms, armour, documents and library records. Object entries model the useful sequence of material, origin, date, markings and documented history.
- The Army Historical Foundation
A historical-education organization supporting the National Museum of the United States Army, with access to articles, collections context and a history centre.
- Library of Congress
Catalogues, research guides, books, photographs and government documents useful for placing small-arms development within wider industrial and military history.
Technical standards
- Sporting Arms and Ammunition Manufacturers' Institute
Current technical standards, cartridge and chamber drawings, a glossary, safety material and informational publications. Use the current drawing rather than copying dimensions from an undated chart.
Federal firearms information
- ATF firearms portal
The federal starting point for current rules, forms, publications and formal firearms information. Historical model context on this site is not legal advice.
- ATF import information
Current agency information about importing firearms, ammunition and defense articles, including reference to the 1989 and 1998 rifle import studies.
Impulse-noise and hearing resources
- NIOSH record: recreational-firearm noise
A public-health record focused on impulse noise, firing environments, muzzle brakes, distance between shooters and hearing-protector use.
- NIOSH hearing-protection guidance
General guidance on protector types, fit, compatibility and the limits of relying only on a package rating.
A practical research method
Begin with the exact marking on the object. Record receiver type, chambering, visible national marks and fixed features. Then compare those observations with an institutional catalogue or a current standard. Treat collector shorthand as a search term rather than as proof. If two reliable records disagree, preserve the disagreement and look for a more specific model or production-era source.
This list is limited to public institutions and standards bodies with pages that could be verified. The aim is a small, durable reference shelf rather than a long directory of uncertain links.