0-16 - a Colt Open Top (or maybe a Colt 1860 Army with Richards-Mason Conversion) in raised hand
0-50 - the woman holds a double barreled shotgun
1-06 - a man at the right carries a pair of ivory gripped SAA "Civilian" or "Artillery" model in holsters
1-17 - again the shotgun
1-19..1-23 - Winchesters, at least one of them (1-23 at the right) a 1873 Short Rifle
1-28 - a horseman carries a long barreled rifle with military style handguard
1-49 - Remington 1858 New Army or Remington 1875 in center
1-51 - a kind of Coach Gun
1-52 - againt a Colt Open Top
1-53 - again a Winchester 1873 Short Rifle
1-55 - ivory gripped SAA
1-55 - I tend to Colt Open Top, exactry an Uberti/Cimarron replica, like this one:
http://www.imfdb.org/wiki/File:Cimarron_Open_Top.jpg
That's all what I can say.