The Remington Model 1858 was a
secondary firearm issued by the United States Army of the Union until
the Colt Manufacturing Company factory fire of 1864. While it is
called Model 1858 for the year it was patented, it was not produced
in full scale production until 1861. [Remington: America's
Oldest Gunmaker, Roy Marcot Bequette, Primedia
1998]