On the gun above i have some questions its the 1858 new army conversion so that would be a single action cartridge revolver or black powder
Click:
http://www.uberti.com/firearms/army-navy-conversion-and-open-top.php
http://www.ubertireplicas.com/1858newimprovedconversion.php
Single action... Cartridge... (.45 Colt in the form linked first above, scroll down to the beginning of the chart)... Others are available in .38 Special as noted in the second link.
Other variations may exist... I'm no expert at all, just a passing Googler...