A locking device for fireahns for enabling releasable locking by blocking or interrupting a triggering mechanism of a firearm, wherein the locking device • features a locking unit arranged on the firearm, wherein the locking unit comprises at least one locking mechanism, • and wherein the locking device further comprises a release element embodied as separate from the firearm, • the locking unit further features at least one activation element that is actable by a user, wherein the activation element is coupled with the triggering mechanism of the firearm in such a way that 1. When the activation element is in a locked position or in a locked mode, the triggering mechanism for firing a shot is blocked, and 2. When the activation element is in an active position or in an active mode, the triggering mechanism can be released, and wherein, when the locking mechanism is in a locking mode, the activation element is blocked from moving or being moved from the locked position or the locked mode to the active position or the active mode, and wherein the locking mechanism has a locking mechanism coupling region and wherein the release element features a release element coupling region that corresponds to said element, and wherein when the two coupling regions (26,27) are coupled, the locking mechanism switches from the locking mode to a release mode, so that, for the duration of the release mode, the activation element can be moved by the user from the locked position or locked mode which blocks or interrupts the triggering mechanism of the firearm to an active position or active mode which releases the triggering mechanism of the firearm, wherein the release element is arranged in an unlocking unit that can be separated from the firearm, wherein the release element is fixed to or integrated in the unlocking unit, wherein the unlocking unit can be a holster or storage container or support device, characterized in that, the activation element can be switched to the active position or active mode only when it has been released by a release element, and as long as the locking mechanism is in the locking mode, the firearm cannot be fired, and the activation element can be moved by the user to an active position or active state by the user's hand, preferably by means of grasping a grip of the firearm, and is held in the active position or active mode, as long as the user's hand is grasping the grip of the firearm, and the activation element switches to the locked position or the locked mode, as soon as the user's hand releases the grip of the firearm. • features a locking unit arranged on the firearm, wherein the locking unit comprises at least one locking mechanism, • and wherein the locking device further comprises a release element embodied as separate from the firearm, • the locking unit further features at least one activation element that is actable by a user, wherein the activation element is coupled with the triggering mechanism of the firearm in such a way that 1. When the activation element is in a locked position or in a locked mode, the triggering mechanism for firing a shot is blocked, and 2. When the activation element is in an active position or in an active mode, the triggering mechanism can be released, 1. When the activation element is in a locked position or in a locked mode, the triggering mechanism for firing a shot is blocked, and 2. When the activation element is in an active position or in an active mode, the triggering mechanism can be released,