1) Firearm action 
Lever-action is a type of firearm action which uses a lever located around the trigger guard area (often including the trigger guard itself) to load fresh cartridges into the chamber of the barrel when the lever is worked. This contrasts to bolt action, semi-automatic, or selective fire weapons. Most lever-action firearms are rifles, but lever-act...
Lever-action is a gun mechanism activated by manual operation of a lever.