Information - Legal
     f   = Facebook links (currently, or semi-currently, maintained sites only)

BATFE: Federal Firearms Regulations Reference Guide 2014
BATFE: Listing of Federal Firearms Licensees (FFLs) - 2017
BATFE: Rules and Regulations Library
Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE)  f
Bureau of Firearms (CA)
Bureau of Land Management (BLM)  f  (California - change the state name in the URL for your state)
California Legislative Information
Congress.gov (bills info)
Dangerous Weapons Control Law (CA)
Federal Firearms License Search (ATFOnline, input FFL number to validate)
FFL Dealer Locator (Gun Broker, search by ZIP or state)
National Firearms Act (NFA) - FAQ, handbook
NRA-ILA: Guide To The Interstate Transportation Of Firearms
Transporting Firearms in California (CA DOJ)
               ELR Resources
Services
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   Retailers/E-tailers
   Training