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.

The Colt M1877 was a double-action revolver manufactured by Colt's Patent Fire Arms from January 1877 until 1909 for a total of 166,849 revolvers. The Model 1877 was offered in three calibers, which lent them three unofficial names: the "Thunderer", the "Lightning", and the "Rainmaker". The principal difference between the models was the cartridge in which they were chambered for, these are the "Thunderer" in .41 Long Colt; the "Lightning" in .38 Long Colt; and the "Rainmaker" in .32 Long Colt. All of the models had a six-round capacity.