Mounting devices for firearms and methods of mounting the same are disclosed. An example mounting device for use with a firearm includes a clamping device, with which the mounting device can be optionally clamped to the firearm. The clamping device includes a rigid clamping jaw arrangement, a movable clamping jaw arrangement opposite the rigid clamping jaw arrangement, and a swiveling lever. The swiveling lever is coupled to a spring device that locks the movable clamping jaw arrangement, and the spring device has a first spring arrangement, which loads the swiveling lever in an opening direction over an entire unlocking path, and a second spring arrangement, which applies a much greater spring tension than the first spring arrangement. The second spring arrangement also loads the swiveling lever via a spring travel in the opening direction and minimizes the spring travel to maintain the seat of the mounting device with respect to the firearm.