Colt Model Guide

THE COLT DOUBLE ACTION REVOLVER
AN INTRODUCTION

The history of the Colt double action revolver starts with Samuel Colt himself.
Colt preferred his single action designs and made it clear that he hated the double action system.  He thought it disturbed the aim and prevented good accuracy.  As long as Colt lived, Colt Firearms would never sell a double action revolver.
As soon as Colt began marketing his revolver others began violating Colt's patents by making copies or versions of his idea. 
Colt would spend a good part of the rest of his life hunting down and suing violators of his patents.
As soon as his patents expired in Europe, there was a mass rush to design and sell revolving pistols.
Among the most prolific were the British and Belgians, who immediately began designing revolvers often with a double action trigger.
It was 15 years after Samuel Colt's death that Colt Firearms finally marketed a double action revolver.

The first Colt to have a double action trigger was the Model 1877.
The 1877 was the first of a number of versions of a double action pistol design that resembled the Colt Single Action Army of 1873 and used some SAA parts, modifed for a DA trigger.
The new double action design utilized the same type loading system of the SAA, a pivoting loading gate and an ejector mounted along the barrel, and a rounded, "Bird's head" grip.
Colt offered a number of options including short barrels without ejector rods, and with barrels as long as 12 inches.
Following Colt's standard practice, the 1877 design was continually manufactured as long as it was selling, even though newer, superior designs were already being marketed by Colt.
The 1877 was made in various forms as late as the Model 1904 Philippine Constabulary.

The next double action revolver Colt fielded was revolutionary. 
In 1889 Colt introduced the world's first double action, swing-out cylinder revolver.  This design was so effective and strong, it became the standard for all double action designs that followed.
The 1889 was named the New Navy Model of 1889.  When the design was also bought by the Army in 1892 the name was changed to the Colt New Army & Navy Model.
Following standard Colt practice, the 1889 was quickly followed up by improved versions each with it's own model number as the Models 1894, 1895, 1896, 1901, and 1903.
These new swing-out cylinder revolvers were made as both military issue and commercial sales firearms, and were extremely popular, selling several hundred thousand guns.

In 1895 Colt brought out a totally new design action in the Colt New pocket revolver.
This was a small frame concealable double action that was the ancestor of all Colt's to follow until 1969.  Only slightly modified over the years, this action was the basis for virtually every Colt double action revolver to follow.  It was last used in the Colt Python until it was discontinued in 2003-2004.

The next advance in double action design came in 1898 with the Colt New Service. 
The New Service was a large frame revolver intended for the most powerful cartridges of the day. 

Meanwhile, Colt was modifying the Pocket Model into what would be Colt's small frame revolver, the Police Positive, made for short cartridges, and the Police Positive Special made for the longer .38 Special.
It was the Police Positive Special that would be made as one of Colt’s most popular and famous guns, the Colt Detective Special.

In 1908 Colt introduced the revolver that would set the standard for the next 60 years. 
This new medium frame revolver was known as the Colt Army Special.  It was the replacement for the overly complex, fragile New Army & Navy models.
The Army Special was an immediate hit with law enforcement and civilians and sold very well.  The Army Special was the basis for every Colt medium frame revolver that would follow and was made in a number of formats from service pistols to target revolvers.

After World War Two, Colt began developing firearms made from new materials.
In 1950, Colt introduced a small frame revolver based on the Detective Special using an aluminum frame.  The Cobra and Agent were the worlds first aluminum framed revolvers and would be best sellers for many years.

In the late 1960's the cost of Colt revolvers was pricing them out of the highly competitive market because of the extensive hand labor needed to build them.
Colt decided to develop an entirely new action design, the first since the Army Special of 1908.  This new design would take full advantage of the latest manufacturing methods, and would eliminate as much hand labor as possible.
In 1969 Colt introduced this new design as the Mark III. 
This was a totally new revolver with nothing in common with the older guns.
Instead of the old Colt Positive Safety design which employed a rebounding hammer and internal hammer block system, the new design used a transfer bar safety and ignition system.
In this system, when the trigger is pulled, a steel block rises up between the hammer and the frame mounted firing pin.  When the hammer drops it strikes the transfer bar which in turn strikes the firing pin, transferring the force.
If the trigger is released, the transfer bar instantly drops down and the hammer cannot contact the firing pin.
This new system was very safe and was both less complex and cheaper to manufacture.

The new revolver was manufactured using internal parts made of "sintered" steel.  This is a process in which powdered steel is heated in a mold until it melts, filling the mold.
When the mold is opened, a virtually finished part is ready for surface hardening and finishing.

Since these molded parts could be made to very tight tolerances, this allowed less skilled production personnel to assemble the guns.
When building a new Mark III revolver, the production fitter would pull a part from a bin full of parts and test fit it.  If the part wasn't a perfect fit, the assembler simply selected another part from the bin until one did fit correctly.  This was much faster than the old way of a Master assembler hand filing, stoning, and bending parts to build a gun.
This new design revolver was extremely strong, and was said by Master gunsmith Jerry Kuhnhausen to be possibly the strongest medium frame, double action revolver ever made.
As with the Army Special, Colt used the basic Mark III action as the basis for an entire series of revolvers ranging from a fixed sight .38 Special service revolver to the deluxe Trooper Mark III .357 Magnum adjustable sight model.
In 1983 Colt introduced a slightly modified version of the Mark III as the Mark V.

In the early 1980's Colt introduced stainless steel to their line of revolvers with the first stainless steel Pythons.
In 1985, Colt used a slightly modified version of the Mark V to make a stainless steel revolver as the King Cobra.

In the 1990's, Colt introduced two new double action revolvers.  The first was the new Anaconda .44 Magnum, the first large frame Colt made since the New Service was discontinued during World War Two.  The second was a new small frame revolver, the .38 Special Colt SF-VI.  The SF-VI was also made as the DS-II and the Magnum Carry in .357 Magnum, Colt's first small frame Magnum revolver.
These later Colt's were made of stainless steel, and were based on the King Cobra design.

In the 1970's Colt began to experience turbulence as a company.  Being a small part of a huge corporation which Colt Firearms had founded, the corporation seemed unsure just what to do with the comparatively small Firearms Division.
Every year of so a new Firearms Division president was sent down by the corporate headquarters.  Most of these men knew nothing about firearms or firearms manufacturing, and it was apparent that some were interested only in making a good impression so they could get promoted within the corporation and away from the firearms part of it.
Attempting to make his mark, each ordered old models discontinued, new models to be introduced and the old discontinued models to be re-introduced.
This, among many other causes eventually led Colt Firearms Division to go bankrupt and be sold by the corporation to new owners.
The new owners were forced to discontinue a number of Colt firearms in 2000, including all the double actions except the Python and the Anaconda.
With revolver sales down in an era of large capacity automatic pistols, and the Python too expensive and difficult to produce, Colt finally discontinued the last of the famous Colt double actions.  The last to go were the Anaconda and the famed Python in 2003-2004.

FRAME SIZES
Prior to World War Two Colt frames were named, usually for the primary gun made on that size.
Colt offered a number of guns based on these frames, but a Detective Special was known as a Police Positive Special frame size, while the Banker's Special was known as a Police Positive frame.
The Army Special/Official Police frame was originally known inside the Colt factory as the "41 frame" because the frame it was made on was originally made for the old .41 Colt Long cartridge. To most people any gun with a medium frame was known as an Official Police frame.

Following World War Two, Colt assigned letter codes to all frame sizes.  Even though a pre-War and post-War Colt's may have the same frame, only the post-War models were given letter codes.  Technically, calling a pre-War Detective Special a "D" frame is incorrect.  However, to avoid confusion it's common to call all Colt  small size frames "D" frames whether made before or after WWII as is calling pre-war medium frames "E" frame models.

Colt's first small frame double action revolver was the Colt Pocket.  That frame was improved and modified several times as different models which were:
New Pocket.
New Police.
Pocket Positive.

The Pocket Positive was further improved as the Police Positive.   This frame was made for short cartridges like the .32 Colt New Police/.32 S&W and the .38 Colt New Police/.38 S&W. 
It was used for:
Police Positive.
Police Positive Target.
Banker's Special.

The Police Positive Special "D" frame was Colt's primary small frame used up until the end of production in 1995. 
It had a longer frame and cylinder for use with longer cartridges like the .38 Special.  It was used for:
Police Positive Special.
Detective Special.
Commando Special
Cobra.
Agent.
Diamondback.
Police Positive MK V.
Viper.
Courier.

The Army Special/Official Police "E" frame was Colt's medium frame as used for all Colt medium framed revolvers from 1908 to 1969.  The firing pin was mounted on the hammer.  It was used for:
Army Special.
Official Police.
Officer's Models.
.38 Special and .22 Trooper.
First Model Border Patrol.
Heavily modified as the Camp Perry Single Shot.
US Colt Commando
Marshall.

The "I" frame was essentially the "E" frame only with the firing pin mounted inside the frame.  It was used for:
The 357 Model.
Later .38 Special and .357 Magnum Trooper.
Python.

NOTE: Due to the similarity of the Colt "E" frame and the "I" frame, these are usually just referred to as the "E&I" frame models.

The "J" frame was the new transfer bar safety-ignition system medium frame introduced in 1969 as a replacement for most of the older medium frame "E&I" models.
Models were:
Trooper Mark III.
Lawman Mark III.
Metropolitan Police.
Official Police Mark III.
Officer's Model Match Mark III.

The "V" frame was a slightly modified Mark III action.  Models were:
Trooper Mark V.
Lawman Mark V.
Peacekeeper.
Boa.
Air Marshall.
Whitetailer.

The "AA" frame was a slightly modified Mark V frame made as:
King Cobra.
Grizzly.
Whitetailer II.
Combat Cobra.

The New Service frame was used for:
New Service.
New Service Target
Shooting Master.
US Model 1909.
US Model 1917.

The "MM" frame was Colt's first large frame since the New Service was discontinued in 1942.  This was used for the Anaconda.

The "SF" frame was Colt's new small frame made of stainless steel with a transfer bar action.  It was made as:
The Colt SF-VI.
DS-II.
Magnum Carry.

COLT DOUBLE ACTION REVOLVER AMMUNITION

In the 1800's and early 1900's Colt developed a number of cartridges for their pistols.  They also chambered Colt pistols in popular cartridges developed by other companies.  Not wanting a competitors name on a Colt firearm, Colt often simply re-named the cartridge with a Colt brand name or developed a cartridge so much like it, it was interchangeable.
As example, Colt didn't want rival Smith & Wesson's name on a Colt revolver, so they simply called the .32 S&W the .32 New Police and the .38 S&W the .38 New Police.
Since most Colt's had long chambers they could chamber both short and long versions of a cartridge.  Therefore, most .38 Colt's could chamber both the .38 Colt Long and Short, and the .41 Colt could chamber both the .41 Colt Long and Short.
With the introduction of the .38 Special, most of these older low pressure black powder era cartridges began to fade, and by World War Two most had disappeared as Colt chamberings.  Bowing to the inevitable, Colt discontinued the New Police markings and used the S&W names for these short cartridges until they finally disappeared as Colt chamberings in the 1960's.
Colt began offering modern cartridges in the 1930's with chambering the New Service and Single Action Army in the then new .357 Magnum developed by Daniel Wesson of Smith & Wesson.
After World War Two, Colt began making more use of the .357, being the first gun company to offer it in a medium frame revolver, the Colt 357 model.
It was only in the 1990's that Colt finally developed a large frame revolver to replace the pre-War New Service.  The new Colt Anaconda was the first double action revolver Colt made in .44 Magnum.

A CHRONOLOGY OF COLT DOUBLE ACTION REVOLVERS

When dealing with Colt firearms much will be heard about "Generations" and "Issues". 
Colt collectors refer to different era Colt Single Action Army revolvers as "Generations" and that term is used only for the Single Actions.
Some Colt double action revolvers that were made over many years are referred to as "Issues". 
The "Issue" term is used on only a few Colt revolvers, like the Detective Special. 
Other models like the Python never changed enough to warrant using the "Issue" term.

This is an entirely arbitrary system and collectors dispute the division of Issues. 
As example, while the Detective Special as made from 1927 to 1946 is usually referred to as the First Issue, Some collectors claim that since from 1927 to 1933 the Detective Special had a square butt and in 1933 it was changed to a round butt, the 1933 to 1946 models should be a Second Issue and the 1927 to 1933 should be the First Issue. 
This gets involved and can be confusing.  We've chosen to go with the most common usage of Issues.

Single Action style loading gate models.
Model 1877 Rainmaker.  1877 to 1909. Made for the .32 Colt Long.
Model 1877 Lightning.  1877 to 1909.  Made for the .38 Colt Long.
Model 1877 Thunderer.  1877 to 1909.  Made for the .41 Colt Long
Model 1878 DA.  1878 to 1909.  Made in a number  of cartridges from the .32-20 to the British .476 Eley.
Model 1902/1904 Philippine Constabulary.  Made in .45 Colt.

Swing-out cylinder models
Model 1889 New Navy. 1887 to 1894. 
Model 1892 New Army & Navy.  Also the Models 1894, 1895, 1896, 1901, and 1903 and the 1905 Marine Corp.  1892 to 1907. 
New Pocket.  1895 to 1905. 
New Police.  1896 to 1907. 
New Police Target.  1897 to 1907.
New Service.  Also the Model 1909 Army Model, the Model 1917, and the 1917 Commercial.  1898 to 1942. 
New Service Target.  1900 to 1940. 
New Service Shooting Master.  ?? to 1942??. 
Officer's Model  First Issue. 1904 to 1908. 
Pocket Positive First Issue.  1905 to 1927. 
Police Positive Special First Issue 1907 to 1927. 
Police Positive Target  First Issue.  1907 to 1927. 
Officer's Model Second Issue. 1908 to 1926.
Army Special.  1908 to 1927. 
Police Positive Target Second Issue.  1926 to 1941. 
Camp Perry.  1926 to 1941.
Banker's Special.  1926 to 1940. 
Detective Special First Issue.  1927 to 1946. 
Officer's Model Target Third Issue.  1927 to 1949. 
Official Police.  1927 to 1969. 
Pocket Positive Second Issue.  1927 to 1940. 
Police Positive Special Second Issue.  1928 to 1946. 
Police Positive Second Issue.  1928 to 1947. 
US Commando.  1942 to 1945. 
Police Positive Special Third Issue.  1947 to 1976. 
Detective Special Second Issue.  1947 to 1972. 
Officer's Model Special Fourth Issue.  1949 to 1952. 
Cobra First Issue.  1950 to 1972. 
US Air Force Aircrewman.  1951. 
US Border Patrol First Issue.  1952. 
Trooper.  1953 to 1969. 
Colt 357.  1953 to 1961.
Officer's Model Match Fifth Issue.  1953 to 1969. 
Courier.  1953 to 1956. 
Colt Marshall.  1954 to 1956.
Python. 1955 to 2003-2004. 
Agent First Issue.  1962 to 1972. 
Diamondback.  1966 to 1991. 
Trooper Mark III.  1969 to 1983. 
Lawman.  1969 to 1983. 
Official Police Mark III. 1969 to 1975. 
Metropolitan Police. 1969 to 1972. 
Officer's Model Match Mark III Sixth Issue.  1969 to 1971. 
Border Patrol Second Issue.  1970 to 1975. 
Detective Special Third Issue.  1973 to 1986. 
Cobra Second Issue. 1973 to 1981. 
Agent Second Issue.  1973 to 1991. 
Police Positive Special Fourth Issue. 1977 to 1978.
Viper.  1977 to 1984.
Trooper Mark V.  1982 to 1986. 
Lawman Mark V.  1984 and 1991. 
Commando Special.  1984 to 1986. 
Peacekeeper.  1985 to 1989. 
Boa.  1985.  
King Cobra.  1986 to 1998. 
Combat Cobra.  1986 to 1987. 
Anaconda. 1990 to 2003-2004. 
Detective Special Fourth Issue.  1993 to 1995. 
Police Positive Mark V Fifth Issue.  1994 to 1995.
Colt SF-VI. 1995 to 1996. 
Python Elite.  1997 to 2003-2004. 
DS-II.  1997 to 1998. 
Magnum Carry. 1999.