The Diamondback DB15 Obsidian AR Pistol in 5.56 NATO with an 11.5-inch barrel and Flat Dark Earth finish is a compact, dependable option for shooters who want a short, maneuverable platform for the range or home defense. Built around a carbine-length gas system and a threaded 4150 Chrome-Moly Vanadium barrel with black nitride treatment, this pistol gives you proven AR controls in a smaller package. The SB Tactical SBA5 brace and Magpul furniture keep it familiar and comfortable, while the included 30-round Magpul PMAG gets you started right out of the box.
| Manufacturer | Diamondback Firearms |
|---|---|
| Model | DB15 Obsidian |
| Material | 4150 Chrome-Moly Vanadium barrel, aluminum receiver |
| Compatibility | Standard AR-15 lower parts and magazines |
| Finish | Flat Dark Earth (FDE) anodized receiver, black nitride barrel |
| Weight | Approximately 5.8 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- 11.5-Inch Barrel with Carbine Gas System — This shorter barrel keeps the pistol compact for close-quarters handling while the carbine-length gas system cycles reliably with a wide range of 5.56 ammo, so you spend more time shooting and less time troubleshooting.
- SB Tactical SBA5 Pistol Brace — The SBA5 gives you a stable shooting platform with an adjustable length of pull, making it easier for newer shooters or smaller family members to get a solid cheek weld without the NFA paperwork of a stock.
- Magpul Grip and Trigger Guard — The Magpul MOE pistol grip has a mild texture that won’t rub your hands raw during a long range session, and the trigger guard leaves room for gloves on cold days.
- 11-Inch M-LOK Handguard with Anti-Rotation Tabs — This free-float handguard keeps your grip hand cool and gives you M-LOK slots for attaching a light or foregrip without worrying about the handguard twisting loose over time.
- Threaded Barrel with A2 Flash Hider — The 1/2×28 threads let you add a suppressor or compensator later, and the included flash hider reduces muzzle rise so you can stay on target faster.
Who It’s For
This AR pistol is a great fit for a family shooter who wants a compact platform that’s easy to handle at an indoor range or during a basic safety class. It also works well for someone building their first AR-style firearm who wants a ready-to-shoot pistol without assembling parts. Because it’s chambered in 5.56 NATO, you can practice with affordable .223 Remington ammo and still have full-power defensive loads available.
Pros & Cons
| Pros | Cons |
|---|---|
| Compact 11.5-inch barrel for easy maneuvering | Muzzle blast and noise are louder than a 16-inch rifle — ear protection is a must |
| SB Tactical SBA5 brace is adjustable and stable | Not as accurate at 200+ yards as a longer-barreled rifle |
| Magpul furniture provides familiar AR controls | Some users may prefer a different grip angle — easily swapped |
| Threaded barrel for suppressor or comp use | Carbine gas system on an 11.5-inch barrel can be slightly over-gassed with hot loads |
Comparison
| Feature | Diamondback DB15 Obsidian | Zev Technologies OZ9C | Geissele Super Duty Pistol |
|---|---|---|---|
| Caliber | 5.56 NATO | 9mm | 5.56 NATO |
| Barrel Length | 11.5 inches | 4.5 inches | 11.5 inches |
| Brace | SB Tactical SBA5 | None (handgun configuration) | SB Tactical SBA3 |
| Handguard | 11-inch M-LOK | Integrated Zev slide | Geissele MK16 M-LOK |
| Price | $1025.97 | $1,899.99 | $1,899.99 |
FAQ
What is the barrel twist rate on the Diamondback DB15 Obsidian?
The barrel has a 1:7 twist rate, which stabilizes both 55-grain and 62-grain 5.56 rounds well. Per Diamondback specs, this twist handles heavier bullets up to 77 grains for accuracy at longer distances.
Does this pistol come with a case or bag?
No, the DB15 Obsidian ships in a factory box with the pistol, one 30-round Magpul PMAG, and a cable lock. You’ll want to pick up a soft case or hard case separately for transport and storage.
Can I install a standard AR-15 stock on this pistol?
No — this is a pistol with a brace, not a rifle. Adding a stock would require a tax stamp and reclassification as a Short-Barreled Rifle under federal law. Keep the brace as configured to stay legal.
Is the handguard compatible with standard AR-15 barrel nuts?
Yes, the 11-inch M-LOK handguard uses a standard barrel nut, so you can swap it out for another free-float handguard if you prefer a different length or style.
Ready to Shoot
This Diamondback DB15 Obsidian AR Pistol gives you a compact, reliable 5.56 platform with modern ergonomics and a brace that makes it easy to shoot accurately. Whether you’re teaching a new shooter or adding a short-barreled option to your collection, it’s ready to go.
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
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Last updated: April 2026
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This Diamondback DB15 Obsidian AR Pistol 5.56 11.5in FDE is ideal for shooters looking to buy guns online with confidence. Built with precision engineering and tested performance, it’s a top-tier choice whether you're looking for home defense, sport shooting, or a trusted everyday carry.
Why Choose the Diamondback DB15 Obsidian AR Pistol 5.56 11.5in FDE?
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