Diamondback Firearms Db15o 5.56mm Black 16" M-lok
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Diamondback Firearms
Diamondback Firearms Db15o 5.56mm Black 16" M-lok
The Diamondback Firearms DB15O in 5.56mm NATO delivers mil-spec reliability and modern ergonomics in a versatile, California-compliant AR-15 platform built for shooters who demand performance without compromise.
- Chambered in 5.56 NATO / .223 Rem for wide ammunition compatibility
- 16" barrel with matte black anodized finish for lasting corrosion resistance
- Forged 7075 T-6 aluminum receiver for exceptional strength-to-weight ratio
- M-LOK handguard enables easy attachment of lights, lasers, and accessories
- Magpul CTR collapsible/folding stock for adjustable length of pull
- Includes one Magpul 30-round PMAG for reliable, drop-free feeding
Who This Is For
The DB15O is an excellent choice for competitive shooters, home defenders, and AR-15 enthusiasts looking for a factory-built rifle that balances quality components with an accessible price point. Whether you're heading to the range for drills or adding a dependable semi-automatic to your collection, the DB15O's M-LOK rail system and Magpul furniture give you a platform ready for immediate customization straight out of the box.
Specifications
| Brand | Diamondback Firearms |
|---|---|
| Model | DB15O |
| Caliber | 5.56 NATO / .223 Rem |
| Barrel Length | 16" |
| Capacity | 30+1 |
| Finish | Matte Black Anodized |
| Receiver Material | Forged 7075 T-6 Aluminum |
| Handguard | M-LOK |
| Stock | Magpul CTR Collapsible/Folding |
| Sights | No Sights Included |
| Magazine Included | 1 × Magpul 30-Round PMAG |
| Action | Semi-Automatic |
Frequently Asked Questions
Is the Diamondback DB15O compatible with standard AR-15 accessories and optics?
Yes. The DB15O is built on a standard AR-15 platform, meaning it accepts mil-spec components and accessories including standard AR-15 handguards, grips, triggers, and buffer systems. The M-LOK rail system is widely supported by accessory manufacturers for lights, foregrips, and sling mounts. The flat-top upper receiver features a standard Picatinny rail, making it compatible with virtually any red dot, holographic sight, or magnified optic on the market.
What is the effective range and performance of the 5.56 NATO / .223 Rem cartridge from a 16" barrel?
The 16" barrel is the most popular choice for 5.56 NATO rifles, offering an excellent balance between velocity and maneuverability. From a 16" barrel, 5.56 NATO ammunition typically achieves muzzle velocities between 2,750–3,050 fps depending on the load. This translates to an effective engagement range of 400–600 yards for most shooters, making the DB15O well-suited for everything from target shooting and varmint hunting to home defense applications.
Does the Diamondback DB15O ship with a 30-round magazine, and are there capacity considerations for California buyers?
The DB15O is listed as including one Magpul 30-round PMAG from the factory. However, California law restricts standard-capacity magazines to 10 rounds for most purchasers. Buyers in California should be aware that the included 30-round PMAG may be subject to state restrictions. Please consult current California Department of Justice guidelines or speak with our staff at Goodland Guns to ensure your purchase complies with all applicable local and state regulations.