Abstract: A clamp for fixing a gun rack to a vehicle includes an elongated frame, a first clamp member for gripping a door frame attached to the frame, a second clamp member for gripping a door frame spaced apart from the first clamp member and movable relative to the frame, and a tightened attached to the frame and to the second clamp member to move the second clamp member relative to the first clamp member to position the clamp members so they grasp a first door frame and a second door frame of the vehicle.