The Colt M1878 is a double-action revolver that was manufactured by Colt's Manufacturing Company from 1878 until 1907. It is often referred to as the "Frontier" or the "Double Action Army" revolver. A total of 51,210 Model 1878 revolvers were manufactured, including 4,600 for the US Ordnance Department. These are known as the "Philippine" or "Alaskan" models.

Colt's Manufacturing Company, LLC is an American firearms manufacturer, founded in 1855 by Samuel Colt and now a subsidiary of Czech holding company Colt CZ Group. It is the successor corporation to Colt's earlier firearms-making efforts, which started in 1836. Colt is known for the engineering, production, and marketing of firearms, most especially between the 1850s and World War I, when it was a dominating force in its industry and a seminal influence on manufacturing technology. Colt's earliest designs played a major role in the popularization of the revolver and the shift away from single-shot pistols. Although Samuel Colt did not invent the revolver concept, his designs resulted in the first very successful model.