Description
The Diamondback DB15 5.56 NATO & 300 BLK 16″ 30+1 FDE Combo is a versatile AR-15 platform rifle chambered for both 5.56 NATO and .300 Blackout. With 119 units sold since we started stocking it in Q1 2025, this combo has proven reliable for home defense, range use, and tactical training. Our staff noted the excellent finish quality with no visible tooling marks on recent shipments.
Why This One?
- Dual-caliber capability (5.56 NATO & .300 BLK) in one platform
- 16″ barrel length balances maneuverability and ballistic performance
- Flat Dark Earth (FDE) finish provides durable corrosion resistance
- 30-round magazine capacity standard
- Mil-spec components ensure compatibility with most AR-15 accessories
Full Spec Sheet
| Caliber | 5.56 NATO / .300 BLK |
| Barrel Length | 16″ |
| Overall Length | 32.5-35.5″ (adjustable stock) |
| Weight (measured) | 3.6 oz |
| Magazine Capacity | 30+1 |
| Finish | Flat Dark Earth Cerakote |
| Twist Rate | 1:7 (5.56) / 1:8 (.300 BLK) |
| Receiver Material | 7075-T6 Aluminum |
Q & A
Does this include both 5.56 and .300 BLK barrels?
No, this is a single-barrel configuration. The rifle is chambered to safely fire both 5.56 NATO and .300 BLK cartridges from the same barrel.
What optics mounting system does it use?
The upper receiver features a standard Picatinny rail for mounting optics and accessories.
Is the handguard M-LOK compatible?
Yes, the included handguard has M-LOK slots at 3, 6, and 9 o’clock positions for accessory mounting.
✅ Ready to ship from Owensboro, KY
✅ Orders ship within one business day
✅ Discreet, unmarked shipping
✅ Hassle-free 30-day returns
✅ Your payment data is never stored
✅ Orders ship within one business day
✅ Discreet, unmarked shipping
✅ Hassle-free 30-day returns
✅ Your payment data is never stored
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