You FOOL, you bought the WRONG gun.
I'm really a 12 year-old kid in New York City, and I've never actually handled a "real" gun.
Actually you've just bought a NIB Classic Colt revolver.
The Trooper Mark III was made from 1969 to 1984.
Give us the the serial number in the format: 1234XX and we can give you a production year.
Here's a post I did on the history of Colt's "J" frame revolvers from another forum:
A brief history of the Trooper Mark III line.
In 1969 Colt finally admitted that they could no longer compete with their old model revolvers.
The old guns like the Trooper, Official Police, Python and Officer's Model Match, simply required too much hand fitting.
Even the "budget" Official Police required a significant amount of highly skilled hand fitting simply to work.
The big cost in gun making is labor charges.
ANY hand work costs money, and the kind of people capable of fitting an old style Colt revolver don't work cheap.
The amount of fitting required ran the cost up above what the market was willing to pay, so something had to change.
So, in 1969 Colt discontinued all the mid-frame revolvers except the Python, and introduced a totally new design.
The new series was based on a new "J" frame, and named the Mark III line.
The "J" frame was, as usual for Colt, an industry "first" in many ways.
The new gun was the world's first revolver designed to be "machine fitted" and would require very little expensive hand fitting.
The new series was the first revolver to make use of "sintered steel".
This is a process similar to the current "MIM" molded steel process.
In this process, powdered steel mixed with a binder is injected into a mold, and heated until the steel melts and fills the mold.
When the part is removed, you have a nearly finished part.
The sintered parts are given a thin case hardened coating.
The "J" guns were the first revolver in which worn parts could not be re-fitted. Worn parts would simply be replaced with new parts.
The case hardened coating is very thin, and any attempt at stoning or even heavy polishing will break through the coating, ruining the part.
The "J" series were the first modern revolver to use the transfer bar safety/ignition system. This was so effective, every revolver designed since uses Colt's design virtually unchanged.
The first in the series was the Trooper Mark III, followed by a range of revolvers using the same action.
The other guns in this series were:
The Lawman, a fixed sight .357 with a non-shrouded 4" barrel. It was also available in a 2" round butt version, in which the later versions had a shrouded Detective Special-type barrel.
The Metropolitan Police, basically a Lawman but in .38 Special only, and 4" only.
The Official Police Mark III, basically the Metro Police, only with the "skinny" Official Police-type barrel, in 4" 5" and 6".
The Officer's Model Match Mark III, basically a Trooper Mark III in .38 Special, and sold as a target model. Only 500 were made.
Customer complaints about the DA trigger of the "J" guns led Colt to redesign the gun, and the new gun was the "V" frame.
This series was limited to the Trooper Mark V, the Lawman V, and a "budget" flat black version known as The Peacekeeper.
To improve the trigger action, Colt altered the gun to Colt's first "short action", redesigned the mainspring assembly, and altered the frame's butt to a round butt design.
Other, cosmetic changes, included a vented barrel.
Later, Colt again changed the revolver to a new "AA" frame. This gun was known as The King Cobra. This was nothing more than the "V" frame made in stainless steel, and fitted with a heavy shrouded barrel. Later the KC was also available in blue.
The "J" frame is a deceptively simple design, with large, sturdy parts.
Master gunsmith Jerry Kuhnhausen believed the Colt "J", "V", and "AA" frame guns are the strongest mid-frame revolvers ever built, due to Colt's forged frames and cylinders, and Colt's superior heat treating.
About the only "weakness" in this series, is the possibility of a firing pin with too hard a heat treat. If dry fired, there's a possibility a hard firing pin could break, in which case the gun MUST be sent back to Colt for a replacement.
This breakage is not that common, but possible.
Factory-only replacement is due to the fact that replacement requires special factory jigs and support fixtures to remove and re-install the pin, without damaging the frame.
So, to prevent any possible problem, the gun should be dry fired with snap caps in place.
The Trooper Mark III, was available in bright blue, bright nickel, and satin Electroless nickel, also known for a time as "Coltguard".
Calibers were .357/.38, 22LR, and 22 Magnum.
Barrel lengths were 4" 6", and later 8".
Early grips were square butt checkered walnut.
Later grips had an odd rounded design with a round shape to the front and bottom of the grip.
Later in production, "hardwood" grips appeared, which were supposed to be used only on the Lawman/Metro guns, but which were also put on the Trooper. These grips have an odd light "orange" color with no figure.
The older Colt guns, like the Python, use an action renowned for accuracy. This is due to the design that forces the cylinder into a tightly locked, perfect alignment with the bore, at the instant of firing. This design depends on a action in perfect adjustment to work.
The "J" series uses a system similar to all other revolver designs, in which the cylinder is allowed a slight amount of freedom to rotate at firing. This allows the cylinder to align itself with the bore.
While not as accurate as the Python, the Trooper III is almost always a very accurate revolver, due in part to the quality and rifling twist of Colt's barrels.
The best source of mechanical info on the Trooper Mark series, including how to disassemble for spring replacement, is Jerry Kuhnhausen's book, "The Colt Double Action Revolvers, A Shop Manual: Vol Two".
This should be a part of every Colt Mark series owner's gear.
By the standards of 1969 the Trooper Mark III was a "budget" gun, but by today's standard it would be considered a top of the line deluxe model.