Perfected mechanical safety device for light firearms such as semiautomatic rifles

A mechanical safety device perfected for firearms including automatic rifles equipped with a safety catch in the under-barrel grip, in which the safety device comprises:

• at least one safety device shaft or pin moveable between an active position disabling use of the firearm and an inactive position enabling functioning of the firearm and, in association with the said safety device pin;
• at least one spring loaded selector element to define the active and inactive positions of the safety device pin, alternately;
• a safety device body located and held in the under-barrel grip on an axis to intersecting the direction of movement of the safety device pin and revolving around the said pin between a position locking the safety device pin to inhibit its movement from the active to the inactive position, and an unlocking position to permit shifting from the active to the inactive position;
• a specific command key to engage and turn the safety device body between the locked and unlocked positions;
• and
• at least one blocking tooth or cam on the safety device body to intercept and axially block the safety catch pin at least in that, active position when the safety device body is in the locked position.