The Buffalo Bill Center of the West in Cody...
The Firearms Museum, to do it justice you could spend all day...
.45-70 Gatling gun..
Liver-eater Johnson's Hawken and knife....
Wade Butcher, Sheffield... most Bowies of the period were made in the UK....
Jedediah Smith's .62 cal. (20 ga.) pistol, some misguided guy of the modern era converted it (back?) to flintlock.....