Patent ID: 7204052

Claim:
An assembly for mounting a firearm sighting device comprising: a sight receiver having an upper interface and a lower interface, said upper interface having a mounting slot formed in an upper surface thereof and a rotatable pin extending through said upper interface adjacent said mounting slot, said pin having a flattened central region; a mounting ring, said mounting ring configured to receive and retain a sighting device, said mounting ring having a mounting lug extending therefrom, said mounting lug having a detent formed in a side thereof; and a firearm interface including an upper portion configured and arranged to engage said lower interface of said sight receiver and a lower portion formed as a modular clamping assembly for releasably attaching said sight receiver to said firearm, wherein said mounting lug is configured to be received into said mounting slot in said sight receiver when said rotatable pin is in a first disengaged position with said flattened central region positioned substantially co-planar with a side wall of said mounting slot, said rotatable pin engaging said detent in said mounting lug when said rotatable pin is rotated into a second engaged position said central region extending at least partially into said mounting slot and engaging said detent in said mounting lug, thereby preventing said mounting ring from being withdrawn from said sight receiver, said mounting ring being engaged in substantial alignment with said sight receiver.