Impressum Media have published the FirearmsGuide.com, a researchable, globally-accessible database of firearms, air guns, and ammunition for industry professionals and enthusiasts. The Guide offers complex search functionality by combining up to 14 key search criteria such as caliber, country, year, action type, stock type, manufacturer, etc.
Impressum Media has a series of video demonstrations and tutorials:
Firearms Guide ONLINE:
Gun Schematics Library:
Side-by-side comparison search feature: