Diamondback Firearms Db15o 5.56mm Fde 16" M-lok
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Diamondback Firearms
Diamondback Firearms Db15o 5.56mm Fde 16" M-lok
The Diamondback Firearms DB15O in 5.56mm NATO delivers a rugged, battle-tested AR-15 platform wrapped in a striking Flat Dark Earth Cerakote finish — purpose-built for reliability, modularity, and out-of-the-box performance.
- Chambered in 5.56 NATO / .223 Rem for versatile, widely available ammunition
- 16" barrel offers an ideal balance of velocity, accuracy, and maneuverability
- Flat Dark Earth Cerakote finish provides corrosion resistance and a tactical aesthetic
- Forged 7075-T6 aluminum receivers deliver exceptional strength-to-weight ratio
- M-LOK handguard enables flexible attachment of lights, grips, and accessories
- Includes Magpul CTR stock and one 30-round PMAG for a complete, ready-to-run package
Who This Is For
The DB15O FDE is an excellent choice for sport shooters, home defenders, and AR enthusiasts who want a dependable, fully configured rifle without the need to source components separately. Its M-LOK platform and Magpul furniture make it equally appealing to customizers looking for a solid foundation to build upon.
Specifications
| Brand | Diamondback Firearms |
|---|---|
| Model | DB15O |
| Caliber | .223 Rem / 5.56 NATO |
| Barrel Length | 16" |
| Capacity | 30+1 |
| Finish | Flat Dark Earth Cerakote |
| Receiver Material | Forged 7075-T6 Aluminum |
| Handguard | M-LOK Compatible |
| Stock | Magpul CTR Collapsible/Folding |
| Included Magazine | 1 × 30-Round Magpul PMAG |
| Sights | None Included |
| Action | Semi-Automatic |
Frequently Asked Questions
Does the DB15O come with sights, or do I need to purchase them separately?
The Diamondback DB15O does not include iron sights from the factory. The flat top Picatinny rail upper receiver is optics-ready, so you'll want to add your preferred red dot sight, magnified optic, or backup iron sights (BUIS). The M-LOK handguard also provides mounting points for a front sight if desired.
Is the DB15O compatible with standard AR-15 parts and accessories?
Yes. The DB15O is built on mil-spec AR-15 architecture, making it compatible with the vast majority of standard AR-15 components including stocks, pistol grips, triggers, handguards, and magazines. The included Magpul CTR stock and PMAG are excellent examples of the quality aftermarket ecosystem this platform supports.
What is the effective range and performance of a 16" 5.56 NATO barrel?
A 16" barrel chambered in 5.56 NATO is a proven choice for ranges out to 400–600 yards depending on the load and shooter skill. It offers a strong balance between muzzle velocity (typically 2,750–3,000 fps with standard 55gr ammunition) and overall rifle length, making it one of the most popular configurations for both recreational shooting and home defense applications.