Handguns
While shotguns have gone almost entirely hammerless (inexpensive single shot models being the main exception), handguns are available in significant numbers in many different forms, with or without exposed hammers. Striker fired guns, which are becoming more common, have no hammer, while many guns that do have hammers, such as revolvers, are available with the hammer shrouded or with the spur bobbed off. To be able to conceal or bob the hammer of a revolver, it must be a double action design, and most semi-automatic pistols with bobbed or concealed hammers are also double action.
Read more about this topic: Hammerless