US Patent 8156678 Adaptive rail system

A detachable rail platform adaptable for selective and secure mounting to a weapon's rear iron sight assembly, the rear iron sight assembly having a sight base and a sight guard. The detachable rail platform includes a body having forward and rearward portions. The body further includes a rail portion and is positionable to envelop the rear iron sight assembly. A first clamp assembly is selectively engageable with the sight base at a predetermined position. A second clamp assembly is selectively engageable with the sight guard. Upon engagement of the first and second clamp assemblies to the sight base and the sight guard respectively, the rail platform is selectively and securely mounted to the weapon.