A self adjusting throw lever and rail clamp system for use with sighting equipment where there is a need to efficiently remove or interchange sighting equipment on a host mounting surface. The throw lever self adjusts to compensate for variations in the host mounting surface, such as an angular rail, and utilizes a buffer to prevent the surface of the mounting surface from becoming marred. No tool is required to adjust the throw lever releasable mounting system as the system has an internal means to self adjust to fit the mounting surface. Once the throw lever is secured in the closed position, tension placed by a thru shaft on the housing of the throw lever prevents free movement of the throw lever.