Colt Canada MRR
- Category
- Carbine
- Barrel
- 295 mm
- Weight, empty
- 2.90 kg
- Introduced
- 2015
About
What it is, and why it matters
The Colt Canada MRR (Modular Rail Rifle) is a semi-automatic, gas-operated AR-15-pattern carbine chambered in 5.56x45mm NATO. Built around a monolithic upper receiver with a continuous top rail and a Magpul M-LOK modular handguard, it accepts interchangeable free-floating cold hammer-forged barrels in lengths from 11.6 to 18.6 inches. Marketed to military, law enforcement, and commercial users, the MRR pairs Colt Canada's chrome-lined barrel technology with optional ambidextrous fire controls and a manual thumb selector.
Colt Canada (formerly Diemaco) is the Canadian small-arms manufacturer behind the C7 and C8 service rifles. The MRR distills decades of that AR-pattern experience into a modular civilian and operational platform that lets users reconfigure barrel length and rail real estate for different roles.
The MRR is offered with multiple upper-receiver rail lengths (Sub-Compact, Small, Medium) and in 5.56x45mm, 7.62x51mm and .300 Blackout chamberings. Commercial 5.56 models are typically semi-automatic only; the modular system allows barrel swaps without specialized armorer tools.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- Colt Canada Corporation
- Category
- Carbine
- Country
- Canada
- Status
- In production
- Produced
- 2015
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 295 mm
- Weight, empty
- 2.90 kg
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Gas operated
- Firing mechanism
- Hammer fired
- Trigger
- Single action
- Capacity
- 30
- Magazine
- Detachable box
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Aluminum
- Barrel
- Steel
- Stock
- Polymer
- Finish
- Anodized
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 880 m/s
- Effective range
- 500 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.
Monolithic upper receiver
Free floating barrel
Cold hammer forged barrel
Chrome lined barrel
M lok handguard- Modular barrel length
Ambidextrous controls
Accessory rail
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 141 5.56x45mm NATO carbines | 2.90 kg | 2.95 kg | Lighter than about 60% |
| Barrel lengthAmong 150 5.56x45mm NATO carbines | 295 mm | 406 mm | Shorter than about 80% |
| Magazine capacityAmong 150 5.56x45mm NATO carbines | 30 | 30 | Near the median |
Answers
Questions about the Colt Canada MRR
How much does the Colt Canada MRR weigh?
The Colt Canada MRR weighs 2.90 kg (6.39 lb) empty.
What caliber is the Colt Canada MRR?
The Colt Canada MRR is chambered in 5.56x45mm NATO.
How many rounds does the Colt Canada MRR hold?
The Colt Canada MRR holds 30 rounds, fed from a detachable box magazine.
How long is the Colt Canada MRR?
The Colt Canada MRR has a 295 mm (11.61 in) barrel.
Who makes the Colt Canada MRR?
The Colt Canada MRR is made by Colt Canada Corporation (Canada). It was designed by Colt Canada Corporation.
When was the Colt Canada MRR introduced?
The Colt Canada MRR was introduced in 2015.
How does the Colt Canada MRR operate?
The Colt Canada MRR uses a gas operated 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
- Canadian Armed Forces
- Canada
Provenance
Confidence in this record
72%
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-canada-mrr' \ --header 'X-API-Key: your_key'{ "id": "colt-canada-mrr", "name": "Colt Canada MRR", "manufacturer": { "id": "colt-canada", "name": "Colt Canada Corporation", "countryCode": "CA", "foundedYear": 2005, "website": "https://www.coltcanada.com", "logoUrl": null, "description": null, "status": "active", "defunctYear": null, "stateOwned": null, "makesFirearms": null, "parentId": null, "predecessorId": null, "createdAt": "2026-02-11 23:44:38", "updatedAt": "2026-02-18 03:43:46", "version": "90455fe86a2368df0893edde7b6c253f95946441351de9e84dbda9781abf0048" }, "category": { "id": "carbine", "name": "Carbine", "description": "Shortened rifles for close-quarters use" }, "country_of_origin": "CA", "year_introduced": 2015, "barrel_length_mm": 295, "weight_empty_g": 2900, "action_type": "gas_operated"}