The hammer block was designed to prevent firing unless the trigger was pulled fully back.
A cross bolt type safety prevents accidental firing and is located above the trigger; the "safe" setting blocks the movement of the trigger.
When steam was used in such a system, the water would condense in the pipes and prevent firing of the weapon.
An interlock prevents firing unless the toggle is fully closed.
This feature aids in preventing premature firing during stressful (combat) situations.
An out of battery safety prevents firing unless the slide is completely in battery.
When buying an electric staple gun, make sure it has a safety switch that locks the trigger and prevents accidental firing.
An interlock prevents firing while the shield is in the way.
To prevent accidental firing when the gun is dropped or bumped.
An integrated, manual safety mechanism prevents accidental firing (this is an improved trigger group from the G3 rifle).
