A hammer block for a firearm is disclosed. The firearm includes a firing pin and a hammer. The hammer is pivotally attached to a hammer pin within a trigger house of a lower receiver. The hammer block includes a body comprising an upper portion and a lower portion. The hammer block also includes a central gap forming two downwardly facing legs in the lower portion of the body. The body is positioned within the trigger housing in front of the hammer with the two downwardly facing legs positioned on the sides of the hammer and the central gap positioned over the hammer so that the hammer rotates into the body and is prevented from engaging the firing pin.

A gun locking device includes a lock removably disposable within a cavity of a gun, such as being slidably received within a magazine well of the gun. An elongated rod is extendable into the gun through a chamber thereof for locking engagement with the lock. An end of the rod defines a plug disposable within the chamber of the gun when the rod is in engagement with the lock to prevent ammunition from being disposed within the chamber and the gun being discharged.

A gun locking device includes a lock removably disposable within a cavity of a gun, such as being slidably received within a magazine well of the gun. An elongated rod is extendable into the gun through a chamber thereof for locking engagement with the lock. An end of the rod defines a plug disposable within the chamber of the gun when the rod is in engagement with the lock to prevent ammunition from being disposed within the chamber and the gun being discharged.

A battery-powered trigger-locking device, which is configured to be disposed on a gun with a trigger for firing, includes a data receiver, a data memory and a logic device for determining whether data received by the receiver is the same, or substantially the same, as data stored in the memory. If a data match is indicated, the logic device causes an electromagnetic device to move a trigger-locking member to an unlocked position, permitting the gun to be fired. A separate electronic gun key is provided to transmit gun unlock data to the data receiver of the trigger-locking device. This gun unlock data may be a password, a long pseudo-random number or biologic data identifying the gun owner or some other person who is licensed or otherwise authorized to fire the gun.

A battery-powered trigger-locking device, which is configured to be disposed on a gun with a trigger for firing, includes a data receiver, a data memory and a logic device for determining whether data received by the receiver is the same, or substantially the same, as data stored in the memory. If a data match is indicated, the logic device causes an electromagnetic device to move a trigger-locking member to an unlocked position, permitting the gun to be fired. A separate electronic gun key is provided to transmit gun unlock data to the data receiver of the trigger-locking device. This gun unlock data may be a password, a long pseudo-random number or biologic data identifying the gun owner or some other person who is licensed or otherwise authorized to fire the gun.

A safety device arrangement for a firearm with a magazine well comprising an insert (3A) adapted to the dimensions and shape of the magazine well and being lockable therein and a rack element (4A) for carrying the firearm, the body of the insert (5A) exposed from the magazine well being adapted in dimensions and shape to fit against the carrier part (17) of the rack element, is characterised in that the carrier part of the rack element is provided with an opening, slot or equivalent (18) and the body of the insert exposed from the magazine well provided with a hollow protrusion (7) adapted to fit to said opening, slot or equivalent and extended through and outside of the carrier part, and on the other hand opening inside the body, and that in the locking mechanism between the insert and the magazine well essential bar or equivalent (9) with its accessories (10, 11, 12) extending inside the insert is implemented to depart from and being lockable in said protrusion. In a preferred embodiment the base part (10) of said bar or equivalent (9) is fitted to pivot in the protrusion (7) and rotate the bar with its accessories between a position locking the insert to the magazine well, and a position releasing the locking, the protrusion and the base part comprising an arrangement (8, 14) for securing the locking position with a lock (22, 23).

A safety device arrangement for a firearm with a magazine well comprising an insert (3A) adapted to the dimensions and shape of the magazine well and being lockable therein and a rack element (4A) for carrying the firearm, the body of the insert (5A) exposed from the magazine well being adapted in dimensions and shape to fit against the carrier part (17) of the rack element, is characterised in that the carrier part of the rack element is provided with an opening, slot or equivalent (18) and the body of the insert exposed from the magazine well provided with a hollow protrusion (7) adapted to fit to said opening, slot or equivalent and extended through and outside of the carrier part, and on the other hand opening inside the body, and that in the locking mechanism between the insert and the magazine well essential bar or equivalent (9) with its accessories (10, 11, 12) extending inside the insert is implemented to depart from and being lockable in said protrusion. In a preferred embodiment the base part (10) of said bar or equivalent (9) is fitted to pivot in the protrusion (7) and rotate the bar with its accessories between a position locking the insert to the magazine well, and a position releasing the locking, the protrusion and the base part comprising an arrangement (8, 14) for securing the locking position with a lock (22, 23).

A firearm cartridge with a specially-configured token disc added to its base. The token includes an outer section and a central strike plate. The strike plate includes a strike ball at its center. The presence of the token increases the effective length of the cartridge and thereby prevents the closure of the bolt of a conventional firearm. As a result, the inventive cartridge cannot be fired in a conventional firearm.

A firearm cartridge with a specially-configured token disc added to its base. The token includes an outer section and a central strike plate. The strike plate includes a strike ball at its center. The presence of the token increases the effective length of the cartridge and thereby prevents the closure of the bolt of a conventional firearm. As a result, the inventive cartridge cannot be fired in a conventional firearm.

A multi-function dry fire training device to be inserted into the chamber of a firearm, which comprises an illuminator for emitting, upon receiving a command from a controller, a beam of visible or invisible illumination from the barrel of the firearm, the beam being parallel to its central axis; a controller for controlling the functionality of the device including illumination of the illuminator, in response to activation of the firearm trigger; an actuator, being electrically connected to the controller, for activating the controller whenever being struck by the firearm striker and a power source for providing DC power to the controller and illuminator.