DAVID L BUTLER, IV
Medical Practice at Winfield Blvd, Pompano Beach, FL

3991500, Nov 16, 1976

Aug 22, 1975

5/606824

Stuart D. Kershner - Bethany CT
David F. Butler - Pompano Beach FL

The United States of America as represented by the Secretary of the Army - Washington DC

F41G 306

42 1S

A shoulder firearm is provided with a receiver-mounted collimating optical ight comprising a housing containing a hollow pivoted, reticle holder, an elongated rod of fluorescent material mounted in the forward end of the holder, an inclined first mirror which reflects light from a reticle at the rear end of the rod transversely to a half-reflecting second mirror, parallel to the first mirror, which, in turn, reflects the light back to the shooter's eye. A vertical range scale is mounted on the second mirror adjacent to the reticle image. To aim the firearm, the shooter aligns the reticle image with a distant target. The reticle is adjusted vertically for different ranges by means of a range knob mounted on the firearm near the trigger and connected by pinion and rack gears to the reticle holder, by rotating the range knob while observing the relative positions of the reticle image and range scale. The reticle includes a horizontal fiducial marker. The positions of the range scale and fiducial marker may be interchanged.