A firearm security device including a surface mountable frame to which a first plate and a second movable plate are attached. A grip pad is attached to each of the opposing inner sides of the fixed and movable plates. A trigger guard stud is attached to and projects from the inner face of the fixed plate. The movable second plate is movable with respect to the first plate from an open position wherein a firearm is positioned with the trigger guard stud projecting through the trigger guard of the firearm, to a closed position where the movable plate is positioned substantially parallel to the fixed plate and at least a portion of the receiver of the firearm is held in a compressive grip between the grip pads. A lock selectively restricts movement of the second movable plate.