Maxim Defense SDX:508
- Category
- Personal Defense Weapon
- Barrel
- 216 mm
- Weight, empty
- 3.35 kg
- Introduced
- 2022
About
What it is, and why it matters
The Maxim Defense SDX:508 is an integrally suppressed AR-platform firearm pairing an 8.5-inch barrel with the integrated DSX-D suppressor and MonoKore technology, billed by Maxim as one of the most robust suppressor systems in its category. SOCOM-tested across calibers, it reduces report and recoil while increasing accuracy, riding on a Gen 7 CQB stock with HK-height rail and M-slot handguard. Chambered in 5.56 NATO, .300 BLK or 7.62x39 and built from titanium and stainless steel.
MSRP $3,695. DSX-D integral suppressor is duty-rated. 4-6 week build to order.
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
- Longer barrel
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 216 mm
- Overall length
- 714 mm
- Weight, empty
- 3.35 kg
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Gas operated direct impingement
- Firing mechanism
- Rotating bolt
- Trigger
- Single stage
- 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
- Dlc type iii anodized
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 940 m/s
- Muzzle energy
- 1767 J
- Effective range
- 300 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.
Integral dsx d suppressor- Monokore suppressor technology
Gen7 cqb stock
Hk height rail
M slot handguard
Ambidextrous controls
Ar15 magazine compatible- Hearing safe
- Titanium components
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 | 3.35 kg | 2.23 kg | Heavier than about 90% |
| Overall lengthAmong 53 personal defense weapons | 714 mm | 582 mm | Longer than about 80% |
| Barrel lengthAmong 55 personal defense weapons | 216 mm | 168 mm | Longer than about 70% |
| Magazine capacityAmong 57 personal defense weapons | 30 | 30 | Holds more rounds than about 70% |
Answers
Questions about the Maxim Defense SDX:508
How much does the Maxim Defense SDX:508 weigh?
The Maxim Defense SDX:508 weighs 3.35 kg (7.37 lb) empty.
What caliber is the Maxim Defense SDX:508?
The Maxim Defense SDX:508 is chambered in 5.56x45mm NATO, .300 AAC Blackout, and 7.62x39mm.
How many rounds does the Maxim Defense SDX:508 hold?
The Maxim Defense SDX:508 holds 30 rounds, fed from a detachable box magazine.
How long is the Maxim Defense SDX:508?
The Maxim Defense SDX:508 is 714 mm (28.1 in) long overall, with a 216 mm (8.50 in) barrel.
Who makes the Maxim Defense SDX:508?
The Maxim Defense SDX:508 is made by Maxim Defense Industries (United States).
When was the Maxim Defense SDX:508 introduced?
The Maxim Defense SDX:508 was introduced in 2022.
How does the Maxim Defense SDX:508 operate?
The Maxim Defense SDX:508 uses a gas operated direct impingement action, and its firing mechanism is rotating bolt.
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
74%
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-sdx-508' \ --header 'X-API-Key: your_key'{ "id": "maxim-defense-sdx-508", "name": "Maxim Defense SDX:508", "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": 215.9, "weight_empty_g": 3345, "action_type": "gas_operated_direct_impingement"}