I realize I didn't fully read your question. Here's a couple of old west guns and the approximate year they were available.

Coach Gun any number of break open 12 gauge shot guns. 1850s

Colt Army Model 1860   .44 caliber cap and ball revolver

Colt Navy Model 1851  .36 caliber cap and ball revolver (Wild Bill Hickock's gun)

Colt "Peacemaker"  .45 caliber (available in other calibers) 1873 

Henry Rifle .44 repeating rifle late 1850s

Sharps Carbine  .52 rifle 1848, .45 metal cartridge around 1873

Springfield Trapdoor Model 1873 .45 rifle

Winchester .44 repeating rifle various models and calibers starting in 1873 (The Gun That Won the West)




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