Colt Trooper Mark III
- Category
- Revolver
- Barrel
- 152 mm
- Weight, empty
- 1.11 kg
- Introduced
- 1969
About
What it is, and why it matters
The Colt Trooper Mark III is a medium-large-frame, six-shot double-action revolver introduced in 1969 as a major redesign of the earlier Trooper. The Mark III introduced Colt's modernized 'J' frame action with a coil mainspring and a transfer-bar-style safety, simplifying manufacture while improving durability. It was offered in .357 Magnum, .38 Special, .22 LR and .22 Magnum with 4-, 6- and 8-inch solid-rib heavy barrels featuring an ejector-rod shroud.
Produced 1969-1983 and succeeded by the Trooper Mark V. Popular as a service and field/duty revolver of its era.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- Colt's Manufacturing Company LLC
- Category
- Revolver
- Country
- United States
- Status
- Discontinued
- Produced
- 1969 to 1983
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 152 mm
- Overall length
- 286 mm
- Weight, empty
- 1.11 kg
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Double action
- Firing mechanism
- Hammer fired
- Trigger
- Double action
- Capacity
- 6
- Magazine
- Revolving cylinder
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Steel
- Barrel
- Steel
- Stock
- Walnut
- Finish
- Blued
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 440 m/s
- Muzzle energy
- 784 J
- Effective range
- 50 m
Trajectory
What the round does downrange
Solved from the muzzle figures and the bullet. The dashed rule is the effective range on the record, and the crosses are the steps the solver returned.
Features
What it has
What the record lists as fitted, drawn from the catalogue.
Adjustable rear sight
Solid rib barrel
Ejector rod shroud
Heavy barrel
Standing
How it compares
Each figure against the firearms of the same type and cartridge that record it, or of the same type where that cartridge has too few. Positions are read to the nearest tenth.
| Measurement | This firearm | Median | Position |
|---|---|---|---|
| Empty weightAmong 53 .357 Magnum revolvers | 1.11 kg | 1.10 kg | Heavier than about 60% |
| Overall lengthAmong 50 .357 Magnum revolvers | 286 mm | 245 mm | Longer than about 80% |
| Barrel lengthAmong 53 .357 Magnum revolvers | 152 mm | 107 mm | Longer than about 90% |
| Magazine capacityAmong 53 .357 Magnum revolvers | 6 | 6 | Near the median |
Answers
Questions about the Colt Trooper Mark III
How much does the Colt Trooper Mark III weigh?
The Colt Trooper Mark III weighs 1.11 kg (2.45 lb) empty.
What caliber is the Colt Trooper Mark III?
The Colt Trooper Mark III is chambered in .357 Magnum.
How many rounds does the Colt Trooper Mark III hold?
The Colt Trooper Mark III holds 6 rounds, fed from a revolving cylinder.
How long is the Colt Trooper Mark III?
The Colt Trooper Mark III is 286 mm (11.26 in) long overall, with a 152 mm (5.98 in) barrel.
Who makes the Colt Trooper Mark III?
The Colt Trooper Mark III is made by Colt's Manufacturing Company LLC (United States).
When was the Colt Trooper Mark III introduced?
The Colt Trooper Mark III was introduced in 1969 and discontinued in 1983.
How does the Colt Trooper Mark III operate?
The Colt Trooper Mark III uses a double action, and its firing mechanism is hammer fired.
Compatibility
Which parts fit this firearm
Studio
Every part that mounts on this, resolved
Not a list the maker typed out: the answer comes from the mounts this firearm exposes and the interface each part needs, so it stays right when either one changes.
- Every part that mounts on any firearm in the catalogue
- Interface standards, platforms and fit overrides
- The same answers through the API and the MCP server
Requires a signed-in GunSpec account on the Studio plan. The answer is computed per part, so it is not part of the public record.
Provenance
What the record holds
Every figure above was taken from one of these pages. The confidence reflects how much of the record came from a page a claim can be checked against.
In service
- United States police departments
- United States
Provenance
Confidence in this record
82%
Stockists
Where to buy
Offers link straight to the shop. GunSpec never takes the order.
No shop has listed this firearm yet
Stock and prices come from the shops themselves. If you sell this firearm, you can list it and it appears here.
List a firearmMCP
Ask an assistant about it
The same record, reached the way a person asks for it rather than the way a program does.
Ask GunSpec
Works with
Point an MCP client at GunSpec and it answers from the catalogue rather than from memory. A free key covers the read tools.
API
The call that returns this record
The same fields, in the same units, from the same endpoint the page reads.
curl --request GET \ --url 'https://api.gunspec.io/v1/firearms/colt-trooper-mk-iii' \ --header 'X-API-Key: your_key'{ "id": "colt-trooper-mk-iii", "name": "Colt Trooper Mark III", "manufacturer": { "id": "colt", "name": "Colt's Manufacturing Company LLC", "countryCode": "US", "foundedYear": 1855, "website": "https://www.colt.com", "logoUrl": null, "description": "American firearms manufacturer headquartered in Hartford, Connecticut. Founded in 1855 and now a subsidiary of Colt CZ Group, continuing production of iconic firearms including the 1911 pistol.", "status": "active", "defunctYear": null, "stateOwned": null, "makesFirearms": null, "parentId": null, "predecessorId": null, "createdAt": "2026-02-11 23:44:38", "updatedAt": "2026-02-18 03:43:38", "version": "7143c7ff3f7e156063a240f2df7b4746ee1c0394d7cd5f592d05bac43233d637" }, "category": { "id": "revolver", "name": "Revolver", "description": "Handguns with a revolving cylinder containing multiple chambers" }, "country_of_origin": "US", "year_introduced": 1969, "barrel_length_mm": 152, "weight_empty_g": 1110, "action_type": "double_action"}