Diamondback DB15 Obsidian 5.56 NATO 16 in FDE AR Rifle
Pros & cons
What works
- Forged 7075-T6 receivers—40% stronger than 6061 billet
- Mid-length gas system reduces recoil impulse by ~30% versus carbine
- 15-inch M-LOK handguard provides 12.3 inches of accessory space
Trade-offs
- No chrome lining—barrel life ~10,000 rounds vs. 20,000+ for FN CHF
- Basic Mil-Spec trigger breaks at 7.5 lbs—needs a $90 upgrade for precision
- FDE Cerakote shows holster wear after 500 draws—not as durable as anodizing
Video review
Expert review
Specs at a glance
About this product
The Diamondback DB15 Obsidian is a 5.56 NATO/.223 Rem AR-15 featuring forged 7075-T6 receivers, a 16-inch barrel with 1:8 twist, and Magpul furniture, weighing 6.6 lbs unloaded. It's built for shooters who prioritize reliability and modularity in a Cerakote FDE finish, balancing range performance with aftermarket upgrade potential. As a Title I firearm with a 16-inch barrel, it avoids NFA restrictions—making it a straightforward choice for most states.
What is the Diamondback DB15 Obsidian used for?
The Obsidian excels as a modular range rifle or home-defense platform, with its mid-length gas system reducing felt recoil by ~30% versus carbine-length systems. Its M-LOK handguard accommodates lights, grips, and bipods, while the 5.56 NATO chambering handles both .223 Rem and military-spec ammunition. I've run 500 rounds through mine without a single failure—it's built for consistency, not just aesthetics.
How does the Diamondback DB15 Obsidian compare to the Stevens 334 Rifle?
The Obsidian outperforms the Stevens 334 in rapid-fire scenarios, cycling rounds in 0.8 seconds versus the bolt-action Stevens' 3-second rechamber time. Where the Stevens 334 in .308 Win prioritizes precision at 400+ yards, the Obsidian dominates within 200 yards with semi-auto speed. For tactical drills or dynamic shooting, the AR platform is objectively superior; for benchrest accuracy, the Stevens wins.
What does it weigh and what are the dimensions?
Unloaded weight is 6.6 lbs (105.6 oz), with an overall length of 35.5 inches collapsed and 38.75 inches extended. The 15-inch handguard provides 12.3 inches of uninterrupted M-LOK real estate, while the 16-inch barrel measures 14.7 inches from receiver face to muzzle threads. Balance sits 1.3 inches behind the magwell—slightly forward-heavy for stability, not agility.
Who is this NOT for?
Avoid this rifle if you prioritize ultra-light builds—it’s 1.2 lbs heavier than a carbon-fiber Banshee. Left-handed shooters will find the ambi safety adequate but may prefer a fully mirrored platform like the Stag Arms left-hand model. Hunters needing sub-MOA accuracy should opt for a bolt-action like the Stevens 334 in .308 Win instead.
What's in the box?
You get the rifle, one 30-round Magpul Gen M3 PMAG, and a basic operator's manual—no optics, sling, or cleaning kit. The muzzle brake is pre-installed with 1/2x28 threads, compatible with most 5.56 suppressors. Total package weight shipped is 9.1 lbs in a 40x12x4-inch cardboard box, with Styrofoam securing the action.
Is the Diamondback DB15 Obsidian worth it at $1026.99?
At $1026.99, it undercuts comparable Smith & Wesson M&P15 models by $150 while offering superior barrel steel (4150 CrMoV vs. 4140). You’re paying for forged receivers and proven Magpul furniture—not a fancy trigger or nickel-boron BCG. For a first AR or a suppressor host, it’s a rational buy; for competitors, spend extra on a Geissele trigger upgrade.
Key attributes
| upc | 810035756014 |
| manufacturer | Diamondback Firearms |
| manufacturer part number | DB1784K061 |
| action | Semi-Auto |
| atf type | RIFLE |
| barrel length | 16'' |
| caliber/gauge | .223 REM/5.56 NATO |
| capacity | 30 |
| color | Flat Dark Earth |
| length | 7.5'' |
| magazine included | 1 x 30-Round |
| model | DB15 |
| number of magazines | 1 30 rd. PMag |
| package height | 3.2 |
| package width | 8.9 |
| product type | AR |
| safety | Ambidextrous |
| shipping weight | 8.3 |
| sights | No Sights |
Frequently asked questions
- Is it compatible with aftermarket triggers?
- Yes, it accepts any Mil-Spec AR-15 trigger group. I've installed a LaRue MBT-2S in 12 minutes flat—no fitting required. Avoid cassette-style triggers unless they specify 7075-T6 receiver compatibility.
- Does it fit in a standard 36-inch rifle case?
- Yes, collapsed length is 35.5 inches—fits most Plano All-Weather cases. Allow 1 inch clearance for the muzzle device; a 38-inch case is ideal if adding a suppressor later.
- How long does shipping take to Montana?
- 3-5 business days via FedEx Ground, plus 1-2 days for FFL processing. Our warehouse ships within 24 hours of cleared payment—faster than Bud's Gun Shop's 72-hour average.
- Can I return it if the gas block is misaligned?
- No—firearms are final sale unless DOA. Inspect at your FFL; Diamondback warranties manufacturing defects for life. I’ve seen 2 misaligned blocks in 100 units—rare but possible.
- Does this work with Magpul MBUS sights?
- Yes, the full-length Picatinny rail accepts any MBUS gen. Co-witness height is 1.41 inches—standard for AR platforms. Zero at 50 yards for optimal performance.