Daniel L Bechtel: Mount for attaching a sighting aid to a pistol. Charles W McHugh, April 28, 1992: US05107612 (60 worldwide citation)

A rigid mounting apparatus for attaaching an auxiliary sighting aid to a pistol. In one embodiment, two major shapes are utilized, one of which has a transverse cross-section that is generally U-shaped; the second shape forms an L-shaped bracket that fits below the barrel of a pistol and lies ahead ...