The SW99 features an internal striker, as opposed to the classical external hammer.
It incorporated the M1915/1919 changes plus adding an external hammer.
The bells also have external hammers for tune playing from a small clavier.
The primary distinguishing feature of the Model 1867 was the external hammer.
The hammerless repeating rifle is a firearm that operates without any external hammer or firing pin.
Some modern coach guns feature internal hammers as opposed to the traditional external hammers.
With no external hammer it operates double action only and is a popular choice for concealed carry.
The most noticeable exterior difference is the P22's slide mounted, thumb operated, ambidextrous safety and its external hammer.
The Peabody action most often used an external hammer to fire the cartridge.