Diamondback DB15 Obsidian 5.56 NATO 16″ OD Green
$1,149.09
The Diamondback DB15 Obsidian 5.56 NATO 16-inch OD Green delivers a forged 7075 T-6 aluminum receiver, mid-length gas system, and Magpul furniture at a price that leaves room for optics and ammo. It’s a ready-to-run carbine for shooters who want modern features without the custom price tag.
Ships to all 50 states. Available nationwide.
Description
The Diamondback DB15 Obsidian in 5.56 NATO with a 16-inch barrel and OD Green Cerakote finish is a semi-automatic rifle built for shooters who demand reliability without the custom-gunsmith price tag. Forged from 7075 T-6 aluminum, this rifle pairs a mid-length gas system with a free-floated 15-inch M-LOK handguard, ambidextrous controls, and Magpul furniture. It’s a production-ready platform that ships ready to run, chambered in 5.56 NATO (.223 Remington compatible).
| Manufacturer | Diamondback Firearms |
|---|---|
| Model | DB15 Obsidian |
| Material | Forged 7075 T-6 aluminum receiver set |
| Compatibility | 5.56 NATO / .223 Remington |
| Finish | OD Green Cerakote |
| Weight | 6.5 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- Forged 7075 T-6 Aluminum Receiver Set — Why it matters: This is the same mil-spec alloy used in duty-grade ARs, offering high tensile strength and long-term durability under heavy use. The hardcoat anodizing underneath the Cerakote adds corrosion resistance.
- Mid-Length Gas System — Why it matters: Longer dwell time reduces bolt carrier velocity and recoil impulse compared to carbine-length systems, improving reliability with a wider range of ammunition and extending parts life.
- 15-inch M-LOK Anti-Rotation Handguard with Full Picatinny Top Rail — Why it matters: The anti-rotation tabs lock the handguard to the barrel nut, preventing shift under bipod or sling tension. The continuous Picatinny top allows direct mounting of optics without adapter plates.
- Ambi Controls (Safety Selector, Charging Handle, Bolt Catch) — Why it matters: Left-handed or support-side shooters can operate the rifle without breaking their firing grip. The ambi bolt catch is particularly useful for malfunction drills and administrative reloads.
- Magpul CTR Stock and MOE K2 Grip — Why it matters: The CTR stock features a friction-lock system to eliminate wobble, and the K2 grip’s more vertical angle promotes a natural wrist position for consistent trigger control. Both are proven components from a brand known for functional design.
Who It’s For
This rifle is built for the shooter who wants a modern, adaptable AR without paying a custom builder’s premium. It suits range enthusiasts who shoot for precision, hunters who need a lightweight, corrosion-resistant rifle for wet conditions, and anyone building a reliable go-to carbine for classes or defensive use. The OD Green Cerakote finish also appeals to shooters who prefer subdued colors for field work.
Pros and Cons
| Pros | Cons |
|---|---|
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Comparison
| Feature | Diamondback DB15 Obsidian | Geissele Super Duty 16-inch | Zev Technologies OZ9C |
|---|---|---|---|
| Receiver Material | Forged 7075 T-6 aluminum | Forged 7075 T-6 aluminum | Billet 7075 T-6 aluminum |
| Gas System | Mid-length | Mid-length | N/A (pistol chassis) |
| Handguard | 15-inch M-LOK anti-rotation | 15-inch M-LOK (Geissele MK16) | N/A |
| Finish | OD Green Cerakote | Black anodized | Black anodized |
| Price | $1,025.97 | $1,899.00 | $1,599.00 |
| Target Market | Value-focused shooters wanting modern features | Duty/competition shooters demanding premium components | Pistol shooters seeking modularity |
Compared to the Geissele Super Duty, the Diamondback offers a similar feature set at roughly half the price, though the Geissele includes a premium trigger and handguard. The Zev OZ9C is a pistol, not a rifle, so the comparison shows the Diamondback’s value as a complete long gun for less than many pistol chassis systems.
FAQ
Does the Diamondback DB15 Obsidian come with a warranty?
Yes, Diamondback Firearms backs the DB15 with a limited lifetime warranty covering manufacturing defects. Per Diamondback specs, the warranty applies to the original owner and covers the receiver set, barrel, and bolt carrier group.
Can I use .223 Remington ammunition in this rifle?
Yes. The chamber is cut for 5.56 NATO, which means it can safely fire both 5.56 NATO and .223 Remington ammunition. The mid-length gas system cycles reliably with standard-pressure .223 loads.
What is the barrel twist rate on the DB15 Obsidian?
The 16-inch barrel has a 1:8 twist rate, per manufacturer specs. This stabilizes bullets from 55 to 77 grains, making it versatile for both plinking loads and heavier match projectiles.
Are the handguard and barrel nut compatible with other AR-15 parts?
The handguard uses a proprietary barrel nut designed for the anti-rotation system, so it’s not interchangeable with standard mil-spec handguards. However, the barrel itself is a standard AR-15 profile and can accept other handguards if you replace the nut.
Does the rifle accept standard AR-15 magazines?
Yes, it ships with a Magpul PMAG 30-round magazine, and it is compatible with all standard AR-15/M16 magazines, including aluminum GI-type, Lancer, and other polymer magazines.
Why Buy From Us
- ✓ Nationwide delivery to all 50 states
- ✓ Ships within 1–2 business days
- ✓ 30-day return policy
- ✓ Secure checkout with encryption
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Last updated: April 2026
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