The Model 1908 Vest Pocket is a compact, hammerless, striker-fired, semi-automatic single action pistol.

Its semi-automatic action originated with the Marlin Model 60.

The reinforced breech is of the vertical wedge type, with a semi-automatic action.

All designated marksman rifles in use today use a semi-automatic action, with some also being able to fire in full-automatic mode.

Therefore, when a semi-automatic action is used it is due to its ability to cross over into roles similar to the roles of standard issue weapons.

It used the semi-automatic action of the older gun as well as its horizontal sliding block breech.

The Mark II lost the semi-automatic action.

It copied the German gun's semi-automatic action and its horizontal sliding block breech.

The Mamba works in semi-automatic, recoil-operated, locked-breech single/double action based on the Browning principle.

It had a semi-automatic action in a bullpup configuration.