Abstract: Presently disclosed is a locking device for a firearm that includes a longitudinally extending frame and a configurable butt support, a configurable action housing, and a barrel lock. The configurable butt support defines an opening for receiving a butt of the firearm, with one or more of the width, length or base of the opening being configurable. The configurable action housing defines a channel between interchangeable opposing profiles, which are associated with the configuration of one or more firearms and inhibit access to at least a trigger of the firearm. The barrel lock is configured to secure the barrel of the firearm when in a locked position, and to release the barrel of the firearm when in an unlocked position. The locking device may also include a biometrically activated lock, such as a fingerprint reader, and a communication interface to provide information about attempts to access the firearm.