Previous manufacturer located in Boston, MA between 1860-1868. Spencer manufactured approximately 144,000 rimfire rifles and carbines, of which approximately 107,000 were contracted to the United States Government during the Civil War.
The brainchild of young Christopher Miner Spencer, more than 13,500 Spencer M1860 Army rifles, 800 M1860 Navy rifles, and 48,000 M1860 Army carbines saw action during the Civil War.
In late 1864, the Chief of Ordnance directed modifications, including reducing the bore from .52 to .50 caliber, and shortening the barrel from 22 inches to 20 inches. The new carbine was designated the Spencer M1865 carbine. Nearly 19,000 were produced by the Spencer Repeating Rifle Company, and another 30,500 by the Burnside Rifle Company, although all were delivered too late to see action in the Civil War. Model 1865 carbines and refurbished M1860 carbines became the mainstay of America's troops on the Western Frontier until replaced by "Trap-Door" Springfield carbines after 1873.
The author wishes to express thanks to Roy Marcot, author of Spencer Repeating Rifles, for providing most of the information listed here.