The Unblinking Eye Gun Pages by Ed Buffaloe - A wonderful resource for many hard to find and lesser known items. 

Black powder rifles & cartridges 

 

Powder and Lead

 

The United States National Archives

 

 

Factory Firearm

Letters of Authenticity 

Colt Archive  Ithaca (Lefever, Western Arms)  L.C. Smith Marlin Savage (A.H.Fox, Stevens)  Smith & Wesson historical foundation Winchester

 

 

Stolen gun database

Although not 100% complete, it's the best there is outside law enforcement and it never hurts to check on possible purchases in the future. 

 

Springfield Research Services 

 

Springfield Armory National Historic Site - Some interesting and unique variations on display here. 

 

Mental Health

 

Hold My Guns - If you, or someone you know is struggling with depression and/or suicidal thoughts, please know there are safe storage options and good people out there willing to help.  

Know the warning signs

24/7 Suicide and Crisis Lifeline - Dial 998 or visit 998 lifeline.org