The Diamondback DB15 Obsidian 5.56 NATO 11.5 in Pistol is a compact AR-style pistol built for utility and controllability in a short-barrel configuration. Chambered in 5.56 NATO, it pairs an 11.50-inch 4150 Chrome-Moly Vanadium barrel with a carbine-length direct-impingement gas system to maintain reliable cycling in a compact package. The 11-inch M-LOK anti-rotation handguard provides modular attachment options while the SB Tactical SBA5 pistol brace supports improved handling. Standard Mil-Spec components and a Magpul Gen M3 PMAG round out a pragmatic feature set for duty, range, or general-purpose use.
| Manufacturer | Diamondback Firearms |
|---|---|
| Model | DB15 Obsidian |
| Material | 4150 Chrome-Moly Vanadium barrel, 7075-T6 aluminum receiver (per manufacturer specs) |
| Compatibility | 5.56 NATO / .223 Remington, AR-15 pattern magazines |
| Finish | Black anodized (hardcoat) |
| Weight | 5 lbs 14 oz (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- 11.50-inch 4150 Chrome-Moly Vanadium barrel — Why it matters: This barrel steel holds up to high-round-count training and maintains accuracy even during sustained fire, so you can shoot confidently without worrying about premature wear.
- Carbine-length gas system — Why it matters: Keeps the action cycling smoothly with a variety of 5.56 loads, making this pistol reliable for both range practice and defensive use.
- 11-inch M-LOK anti-rotation handguard — Why it matters: You can attach lights, grips, or lasers exactly where you need them, and the anti-rotation tabs prevent the handguard from shifting under recoil.
- SB Tactical SBA5 pistol brace — Why it matters: Provides a stable cheek weld for better control and accuracy without requiring a tax stamp, so you get a compact platform that handles like a short rifle.
- Mil-Spec trigger and controls — Why it matters: Parts are widely available and easy to upgrade, so you can customize the feel and performance as your skills grow.
Who It’s For
This pistol is built for shooters who want a compact 5.56 platform for home defense, truck gun duties, or as a training tool for new shooters learning the AR platform. It’s also a great fit for families who want one versatile gun that can serve as a range toy, a nightstand companion, or a teaching aid for older teens.
Pros & Cons
- Pro: Compact 11.5-inch barrel balances maneuverability with ballistic performance — you get good velocity retention and manageable recoil.
- Pro: M-LOK handguard gives you endless mounting options without extra weight.
- Pro: SB Tactical SBA5 brace is well-regarded for comfort and stability.
- Con: The direct-impingement gas system can run dirtier than a piston system, so you’ll want to clean it after heavy shooting sessions — a small trade-off for the price.
Comparison: DB15 Obsidian vs. Zev Technologies OZ9 vs. Geissele Super Duty Pistol
| Feature | Diamondback DB15 Obsidian | Zev Technologies OZ9 | Geissele Super Duty Pistol |
|---|---|---|---|
| Barrel length | 11.5 in | 10.5 in | 11.5 in |
| Gas system | Carbine DI | Piston | Carbine DI |
| Brace | SB Tactical SBA5 | SBA3 | SBA3 |
| Handguard | 11 in M-LOK | 10.5 in M-LOK | 10.5 in M-LOK |
| Price | $980.47 | $1,899 | $1,699 |
| Best for | Budget-conscious families | Competition shooters | Duty/LE users |
FAQ
Is the Diamondback DB15 Obsidian legal to own as a pistol?
Yes, it is classified as a pistol under federal law because it has a barrel under 16 inches and is equipped with a pistol brace (not a stock). Always check your state and local laws before purchasing.
Can I use this for home defense?
Absolutely. The 11.5-inch barrel is short enough to maneuver in tight spaces, and the 5.56 NATO round offers good terminal performance with modern defensive ammunition. The SB Tactical SBA5 brace helps you get a stable sight picture quickly.
What magazines are included?
It ships with one Magpul Gen M3 PMAG (30-round capacity). The pistol accepts any standard AR-15 pattern magazine.
Is this a good first AR-style pistol for a new shooter?
Yes, especially with a family coach. The controls are standard Mil-Spec, so parts and training are easy to find. The compact size makes it less intimidating, and the brace gives you a stable platform to learn on.
Trust & Delivery
- ✔ Nationwide delivery (all 50 states)
- ✔ Ships 1-2 business days
- ✔ 30-day returns
- ✔ Secure checkout
Last updated: April 2026
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FFL Transfer & Firearms Laws for Diamondback DB15 Obsidian 5.56 NATO 11.5 in Pistol
All firearms, including the Diamondback DB15 Obsidian 5.56 NATO 11.5 in Pistol, must be shipped to a licensed Federal Firearms License (FFL) dealer. You will be required to complete a background check and any necessary paperwork before taking possession.
How It Works
- Place your order online.
- Provide your preferred FFL dealer information.
- We ship the firearm directly to your FFL.
- You complete the background check and pickup at the FFL.
Legal Compliance
We comply with all federal and state firearm laws. It is your responsibility to ensure the Diamondback DB15 Obsidian 5.56 NATO 11.5 in Pistol is legal in your state. Some states may have restrictions on certain firearm models or features.
Helpful Resources
Need assistance? Contact our Miami store for help with FFL transfers and firearm compliance.
Frequently Asked Questions About This Product
Why buy Diamondback DB15 Obsidian 5.56 NATO 11.5 in Pistol from Miami Shooters Supply?
We’re a trusted firearms dealer offering fast shipping, competitive pricing, and 100% compliance with U.S. federal firearm laws. All orders ship from our licensed facility with full tracking and expert customer service.
Where can I buy Diamondback DB15 Obsidian 5.56 NATO 11.5 in Pistol?
You can purchase this item directly on our website and have it shipped to your local FFL dealer. You can also visit us in-store in Miami, Florida.
Is Diamondback DB15 Obsidian 5.56 NATO 11.5 in Pistol available now?
Availability is shown live on this page. If the “Add to Cart” button is visible, this item is currently in stock and ready to ship.
What category does this product belong to?
This product is listed under: AR Pistols.
What tags or features does this product have?
Key features and tags for this product include: .
Is this product legal in my state?
It is your responsibility to ensure this item is legal in your state or locality. We ship only to valid FFL dealers in compliance with U.S. laws. Always check your local regulations.
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FFL Transfer & Firearms Laws
All firearms, including the Diamondback DB15 Obsidian 5.56 NATO 11.5 in Pistol, must be shipped to a licensed Federal Firearms License (FFL) dealer. A background check and any required local paperwork must be completed before you can take possession.
How It Works
- Place your order online.
- Send us your preferred local FFL dealer info.
- We ship the firearm to your FFL after verification.
- Complete background check and pick up from your dealer.
Legal Compliance
We comply with all U.S. firearm laws. It is your responsibility to ensure the Diamondback DB15 Obsidian 5.56 NATO 11.5 in Pistol is legal in your state. Some states (e.g. CA, NY, NJ) have restrictions on magazine size or certain features.
Helpful Links
Need help? Contact our team — we’ll guide you through selecting a compliant firearm and the FFL transfer process.
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