The Diamondback DB15 .300 BLK 16″ 30rd ODG/Black is a direct-impingement modern sporting rifle built on a forged 7075-T6 aluminum receiver. Chambered in .300 AAC Blackout with a 16-inch barrel and 15-inch M-LOK handguard, it ships with a 30-round Gen 2 PMAG. This is a no-nonsense platform for suppressed or unsuppressed shooting, delivering reliable subsonic and supersonic performance out of the box.
| Manufacturer | Diamondback Firearms |
|---|---|
| Model | DB15 |
| Material | Forged 7075-T6 aluminum receiver; 4140 steel barrel |
| Compatibility | .300 AAC Blackout ammunition; standard AR-15 magazines and parts |
| Finish | ODG Cerakote on receiver; black nitride barrel (per manufacturer specs) |
| Weight | 6.8 lbs (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- 16″ 4140 Steel Barrel with 5/8×24 Threads – Why it matters: The threaded muzzle accepts standard .30-caliber suppressors and muzzle devices without adapter plates, critical for subsonic .300 BLK builds.
- 15″ Free-Float M-LOK Handguard – Why it matters: Provides 270 degrees of M-LOK slots for lights, lasers, and grips; free-float design eliminates barrel contact for consistent accuracy with both subsonic and supersonic loads.
- B5 Multicam Polymer Furniture – Why it matters: The B5 Systems grip and stock offer a positive texture even in wet conditions, and the stock has a non-slip rubber buttpad for shouldering stability.
- Forged 7075-T6 Upper and Lower Receiver – Why it matters: Forged aluminum is denser than cast alternatives, resisting flex under heat and impact; compatible with all mil-spec AR-15 lower parts.
- 30-Round Magpul Gen 2 PMAG Included – Why it matters: Ships ready to shoot with the industry-standard magazine; the Gen 2 has anti-tilt follower and impact-resistant polymer body.
Who It’s For
This rifle is built for law enforcement patrol officers who need a compact .30-caliber carbine for suppressed entry work, and for civilian shooters running subsonic loads for home defense or hog hunting. It also suits competitive shooters in PCC divisions that allow .300 BLK.
Pros & Cons
- Pro: Sub-MOA accuracy with match-grade supersonic ammunition; 1:7 twist stabilizes 220-grain subsonic rounds reliably.
- Pro: Full-length M-LOK top rail and handguard allow mounting IR lasers and thermal optics without extra adapters.
- Con: Trigger is mil-spec single-stage with noticeable creep; most serious shooters will swap it for a drop-in trigger. According to Diamondback specs, the factory trigger pull is 6.5–7.5 pounds.
Comparison: DB15 vs. Zev Technologies OZ9 vs. Geissele Super Duty
| Feature | Diamondback DB15 .300 BLK | Zev Technologies OZ9 | Geissele Super Duty |
|---|---|---|---|
| Caliber | .300 AAC Blackout | 9mm | 5.56 NATO |
| Barrel Length | 16″ | 16″ | 16″ |
| Receiver Material | Forged 7075-T6 | Billet 7075-T6 | Forged 7075-T6 |
| Handguard | 15″ M-LOK aluminum | 15″ M-LOK aluminum | 15″ M-LOK aluminum |
| MSRP | $659.69 | ~$1,400 | ~$1,800 |
| Suppressor Ready | 5/8×24 threaded barrel | Not standard | 1/2×28 threaded barrel |
FAQ
Does the Diamondback DB15 .300 BLK come with a suppressor?
No. The rifle ships with a 5/8×24 threaded barrel and a standard A2 flash hider. You must purchase a suppressor separately and ensure NFA compliance.
Can I use 5.56 NATO magazines in this .300 BLK rifle?
Yes. The DB15 .300 BLK uses standard AR-15 lower receivers and magazines. The included Gen 2 PMAG works for both .300 BLK and 5.56, but always verify ammunition type before loading.
What twist rate is the barrel?
The 16-inch barrel has a 1:7 twist rate, optimized for stabilizing 220-grain subsonic rounds while still handling 110-grain supersonic loads accurately.
Is this rifle California compliant?
No. As shipped, the DB15 has a standard 30-round magazine and pistol grip, which do not comply with California, New York, or similar state laws. Check your local regulations before ordering.
Over 35% of U.S. law enforcement agencies now authorize .300 BLK patrol carbines for suppressed operations (2025 industry survey). The DB15 delivers that capability at a price point that leaves budget for optics and a suppressor.
Trust & Delivery
- ✓ Nationwide delivery to all 50 states (restrictions apply for certain states; see product page for details)
- ✓ Ships within 1–2 business days
- ✓ 30-day return policy on unopened, unfired firearms
- ✓ Secure checkout with 256-bit encryption
Related: .300 Blackout Rifles | AR-15 Uppers | Suppressor-Ready Rifles
Last updated: April 2026
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