Description
The Diamondback DB15 Obsidian is a well-equipped 5.56 AR-15 finished in Flat Dark Earth Cerakote from the receivers to the furniture. It runs a 16 inch nitrided barrel with a mid-length gas system, a 15 inch M-LOK handguard, ambidextrous controls, and Magpul furniture, and it ships with a 30 round PMAG.
Diamondback DB15 Obsidian Barrel and Muzzle Brake
The barrel is 4150 chrome moly vanadium steel in a medium contour, black nitrided inside and out, with a 1:8 right hand twist. A 1:8 twist is the most versatile choice in 5.56: it stabilizes 55 grain bulk ammunition and 77 grain match loads equally well, so you are not limited to one end of the bullet weight range.
The muzzle wears the Diamondback Obsidian brake threaded 1/2×28, which is where the rifle gets its name. It is a genuinely effective brake rather than a decorative one, and it keeps the rifle flat enough that you can watch your own hits through a low-power variable. Gas is mid-length, which on a 16 inch barrel gives a softer, longer impulse than the carbine-length system found on cheaper builds.
Diamondback DB15 Obsidian Handguard and Controls
The 15 inch M-LOK handguard uses an anti-rotation mounting design and carries a full-length Picatinny top rail that runs continuous with the upper receiver. It free floats the barrel and gives you M-LOK slots at multiple clock positions for a light, a bipod, or a hand stop.
Ambidextrous safety and magazine catch come standard, which is not typical at this price and is a real advantage for left handed shooters. The bolt carrier is a mil-spec 8620 carrier that has been shot peened and magnetic particle inspected. Furniture is Magpul: a CTR stock and a K2 grip, both in FDE to match the receivers.
Specifications
- Model: DB15 Obsidian
- Manufacturer part number: DB1784K061
- Caliber: 5.56x45mm NATO, also accepts 223 Remington
- Action: Semi-automatic, direct impingement
- Capacity: 30+1, one Magpul PMAG included
- Barrel length: 16 in., medium contour, 4150 CrMoV, black nitride
- Twist rate: 1:8 right hand
- Gas system: Mid-length
- Muzzle: Diamondback Obsidian muzzle brake, 1/2×28 threads
- Handguard: 15 in. M-LOK, anti-rotation, full Picatinny top rail
- Bolt carrier: Mil-spec 8620, shot peened, magnetic particle inspected
- Controls: Ambidextrous safety selector and magazine catch
- Stock: Magpul CTR
- Grip: Magpul K2
- Finish: Flat Dark Earth Cerakote
- Weight: 6.6 lbs.
- Overall length: 33 in. collapsed to 36.25 in. extended
- Sights: None, optic ready
- UPC: 810035756014
Why Buyers Choose the Diamondback DB15 Obsidian
This is a lot of rifle for the money. Ambidextrous controls, a mid-length gas system, a nitrided 4150 barrel, a real muzzle brake, a free-floating 15 inch rail, and Magpul furniture are the exact upgrades most people make to an entry-level AR, and buying them separately adds up quickly. Having them from the factory in a matched FDE Cerakote makes for a rifle that looks and shoots well above its price.
The full-coverage FDE Cerakote is also practical, not just cosmetic. Cerakote handles moisture and abrasion much better than anodizing alone, and the lighter color keeps the rifle from soaking up heat in the sun the way a black gun does.
Who Should Buy It
The Diamondback DB15 Obsidian suits first-time AR buyers who want to skip the upgrade cycle, left handed shooters who want ambi controls without paying for a premium billet lower, and anyone building a general-purpose 5.56 for range work, training, or home defense. It is also a solid hog and predator rifle with the right optic. If you need a competition-grade trigger out of the box, budget for a drop-in unit, because this one ships with a standard mil-spec trigger.
Learn more from Diamondback Firearms, or browse the rest of our firearms selection.
Every firearm we list ships to your chosen FFL and is transferred there after a background check.
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