Are you real sure about that spelling? The only gunsmith known to have worked in Cincinnatus, New York, was Rensselaer R. Moore, which sounds like too good a match to be coincidence. He stamped his rifles "R. R. MOORE CINCINATTUS NY". He worked in Cincinnatus circa 1837 - 1866. In mid-year 1866 he moved to Cortland, New York, where he continued in business until his death in 1877. Rifles made in Cortland are stamped "R. R. MOORE CORTLAND NY". Many of his rifles are serial numbered. Many also have an eagle stamped after his name and address.
R. R. Moore was born in New York in 1821 or 1822, and claimed in 1855 that he had lived in Cincinnatus his entire life. He died in Cortland, N Y , on January 11, 1877.
R. R. Moore was by no means a crude country blacksmith/gunsmith. He made extremely high quality rifles, including some very complex long range target rifles with false muzzles and guide bullet starters. Many of these were equipped with a full length scope of Moore's own manufacture. He also made double and three barreled rifles and rifle/shotgun combinations.
There are 19 pages devoted to R. R. Moore and his work, in THE NEW YORK STATE FIREARMS TRADE, Vol 3 by H. J. Swinney/ Tom Rowe. These include beautiful photographs of nine different rifles.