CMMG Resolute Mk4
- Category
- Carbine
- Barrel
- 409 mm
- Weight, empty
- 2.90 kg
- Introduced
- 2018
About
What it is, and why it matters
The CMMG Resolute Mk4 is a carbine-length AR-15 pattern semi-automatic rifle built on CMMG's full-size Mk4 platform and positioned between the company's compact Banshee pistols and long-range Endeavor rifles. Chambered standard in 5.56x45mm NATO with a 16.1-inch (or 14.5-inch pinned-and-welded to 16.1") medium-taper barrel, the Resolute Mk4 ships with CMMG's ZEROED line of enhanced components - an ambidextrous charging handle, ambidextrous safety selector, drop-in single-stage trigger, and oversized bolt catch. Aircraft-grade 7075-T6 aluminum upper and lower receivers carry a durable Cerakote finish offered in over a dozen colors, while the M-LOK free-float handguard provides 3, 6, 9, and 12 o'clock mounting. CMMG offers the Resolute Mk4 across an unusually broad caliber range including 5.56mm, .300 Blackout, .350 Legend, .22 ARC, 6mm ARC, 6.5 Grendel, and pistol calibers, making it one of the most configurable carbines in the lineup.
CMMG renamed and consolidated its earlier numbered '100/200/300' series rifles under the Resolute branding to create a clearer product identity for its carbine-length offerings, manufactured in Boonville, Missouri.
MSRP approximately $1,599. The Resolute line is CMMG's carbine-length family (16.1" barrels) sitting between the compact Banshee and the long-range Endeavor. The 'Mk4' designation indicates the AR-15 (small-frame) platform; CMMG also offers the Resolute in Mk47 (7.62x39), Mk57 (5.7x28mm), and Mk3 (.308/AR-10) platform variants. All Resolute rifles use a rifle- or mid-length gas system with direct impingement, though Radial Delayed Blowback is available in pistol-caliber configurations.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- CMMG Inc.
- Category
- Carbine
- Country
- United States
- Status
- In production
- Produced
- 2018
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 409 mm
- Overall length
- 826 mm
- Weight, empty
- 2.90 kg
- Weight, loaded
- 3.09 kg
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Gas operated direct impingement
- Firing mechanism
- Hammer fired
- Trigger
- Single stage
- Trigger pull
- 28.0 N
- Capacity
- 30
- Magazine
- Detachable box
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Aluminum alloy
- Barrel
- Steel
- Stock
- Polymer
- Finish
- Cerakote
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 905 m/s
- Muzzle energy
- 1640 J
- Effective range
- 500 m
- Maximum range
- 3600 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.
M lok handguard
Free floating handguard
Ambidextrous controls
Ar15 pattern
Picatinny rail
Threaded barrel
Collapsible stock
Single stage trigger
Muzzle brake
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% |
| Overall lengthAmong 144 5.56x45mm NATO carbines | 826 mm | 838 mm | Shorter than about 60% |
| Barrel lengthAmong 150 5.56x45mm NATO carbines | 409 mm | 406 mm | Longer than about 90% |
| Magazine capacityAmong 150 5.56x45mm NATO carbines | 30 | 30 | Near the median |
Answers
Questions about the CMMG Resolute Mk4
How much does the CMMG Resolute Mk4 weigh?
The CMMG Resolute Mk4 weighs 2.90 kg (6.40 lb) empty and 3.09 kg (6.81 lb) loaded.
What caliber is the CMMG Resolute Mk4?
The CMMG Resolute Mk4 is chambered in 5.56x45mm NATO.
How many rounds does the CMMG Resolute Mk4 hold?
The CMMG Resolute Mk4 holds 30 rounds, fed from a detachable box magazine.
How long is the CMMG Resolute Mk4?
The CMMG Resolute Mk4 is 826 mm (32.5 in) long overall, with a 409 mm (16.1 in) barrel.
Who makes the CMMG Resolute Mk4?
The CMMG Resolute Mk4 is made by CMMG Inc. (United States).
When was the CMMG Resolute Mk4 introduced?
The CMMG Resolute Mk4 was introduced in 2018.
How does the CMMG Resolute Mk4 operate?
The CMMG Resolute Mk4 uses a gas operated direct impingement 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.
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/cmmg-resolute-mk4' \ --header 'X-API-Key: your_key'{ "id": "cmmg-resolute-mk4", "name": "CMMG Resolute Mk4", "manufacturer": { "id": "cmmg", "name": "CMMG Inc.", "countryCode": "US", "foundedYear": 2002, "website": "https://cmmg.com", "logoUrl": null, "description": null, "status": null, "defunctYear": null, "stateOwned": null, "makesFirearms": null, "parentId": null, "predecessorId": null, "createdAt": "2026-02-11 23:44:38", "updatedAt": "2026-02-18 03:43:43", "version": "a7e68de40df3e6e52ce7309f32c551e46f69ca644a4955a2de5291d2bfbf7a0b" }, "category": { "id": "carbine", "name": "Carbine", "description": "Shortened rifles for close-quarters use" }, "country_of_origin": "US", "year_introduced": 2018, "barrel_length_mm": 409, "weight_empty_g": 2903, "action_type": "gas_operated_direct_impingement"}