A Colt Double Action (or Colt D. A. for short) is any of the double-action revolvers manufactured by the Colt's Manufacturing Company. The term is most commonly used for the historical 1877 and 1878 models, but it also may refer to the following firearms:
Colt M1877 Colt M1878 Colt M1892 Colt New Service Colt Cobra Colt Trooper Colt Python Colt Anaconda Colt King Cobra