Abstract: An device for securing a fire arm has a base with a floor and two upstanding sidewalls, each sidewall defining a groove adjacent the floor. The device also has a first member pivotally mounted between the two sidewalls, a second member slidable in the grooves and adapted to couple with the first member to lock the fire arm between two protruded parts of the fire arm, a lock pin for locking the second member and a lock for locking the lock pin. The floor has at least one through-holes each for passage of a fastener, each through-hole being disposed under at least one of the first member and the second member, so that the fastener is inaccessible when the device is in use.