Maxim Defense MD:9 CQB 905
- Category
- Personal Defense Weapon
- Barrel
- 140 mm
- Weight, empty
- 2.77 kg
- Introduced
- 2022
About
What it is, and why it matters
The Maxim Defense MD:9 CQB 905 is a 9mm AR-9 pistol with a 5.5-inch barrel and either the Maxim Defense pistol system or CQB brace, feeding from Glock-pattern magazines. It features a free-floating barrel under a monolithic-style upper receiver with M-slot compatibility, an ALG Combat trigger and a flash hider, all built in the USA from 7075 aluminum and tool steel. The 905 designation reflects the 9mm chambering and roughly 5-inch barrel class.
MSRP $2,195. Accepts Glock 9mm pattern magazines (G19 and longer). Thread pitch 1/2-28. Often sold out.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- Maxim Defense Industries
- Category
- Personal Defense Weapon
- Country
- United States
- Status
- In production
- Produced
- 2022
- Variant of
- Cqb brace
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 140 mm
- Overall length
- 508 mm
- Weight, empty
- 2.77 kg
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Blowback
- Firing mechanism
- Hammer fired
- Trigger
- Single stage
- Capacity
- 15
- Magazine
- Detachable box
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Aluminum
- Barrel
- Steel
- Stock
- Polymer
- Finish
- Nitride type iii anodized
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 360 m/s
- Muzzle energy
- 481 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.
Cqb pistol brace
Flash hider
Glock magazine compatible
Alg combat trigger
M slot handguard
Free floating 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 54 personal defense weapons | 2.77 kg | 2.23 kg | Heavier than about 80% |
| Overall lengthAmong 53 personal defense weapons | 508 mm | 582 mm | Shorter than about 80% |
| Barrel lengthAmong 55 personal defense weapons | 140 mm | 168 mm | Shorter than about 70% |
| Magazine capacityAmong 25 9x19mm Parabellum personal defense weapons | 15 | 20 | Holds fewer rounds than about 90% |
Answers
Questions about the Maxim Defense MD:9 CQB 905
How much does the Maxim Defense MD:9 CQB 905 weigh?
The Maxim Defense MD:9 CQB 905 weighs 2.77 kg (6.10 lb) empty.
What caliber is the Maxim Defense MD:9 CQB 905?
The Maxim Defense MD:9 CQB 905 is chambered in 9x19mm Parabellum.
How many rounds does the Maxim Defense MD:9 CQB 905 hold?
The Maxim Defense MD:9 CQB 905 holds 15 rounds, fed from a detachable box magazine.
How long is the Maxim Defense MD:9 CQB 905?
The Maxim Defense MD:9 CQB 905 is 508 mm (20.0 in) long overall, with a 140 mm (5.50 in) barrel.
Who makes the Maxim Defense MD:9 CQB 905?
The Maxim Defense MD:9 CQB 905 is made by Maxim Defense Industries (United States).
When was the Maxim Defense MD:9 CQB 905 introduced?
The Maxim Defense MD:9 CQB 905 was introduced in 2022.
How does the Maxim Defense MD:9 CQB 905 operate?
The Maxim Defense MD:9 CQB 905 uses a blowback 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
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/maxim-defense-md9-905' \ --header 'X-API-Key: your_key'{ "id": "maxim-defense-md9-905", "name": "Maxim Defense MD:9 CQB 905", "manufacturer": { "id": "maxim-defense", "name": "Maxim Defense Industries", "countryCode": "US", "foundedYear": 2014, "website": "https://maximdefense.com", "logoUrl": null, "description": null, "status": null, "defunctYear": null, "stateOwned": null, "makesFirearms": null, "parentId": null, "predecessorId": null, "createdAt": "2026-05-26 23:17:02", "updatedAt": "2026-05-26 23:17:02", "version": "dfe683bac783d6db254ae0d3a178639557add21098804dfbed602082544252e0" }, "category": { "id": "personal-defense-weapon", "name": "Personal Defense Weapon", "description": "Compact firearms designed for non-frontline military personnel" }, "country_of_origin": "US", "year_introduced": 2022, "barrel_length_mm": 139.7, "weight_empty_g": 2767, "action_type": "blowback"}