Diamondback DB15 Obsidian 5.56 NATO 16 in FDE
About this product
The Diamondback DB15 Obsidian is an AR-style rifle chambered in 5.56 NATO with a 16-inch barrel and FDE Cerakote finish, built on forged 7075-T6 aluminum receivers for durability and reliability. It's designed for shooters who need a versatile platform for range training, home defense, and compliance with standard sporting rifle regulations. This rifle balances military-spec components with aftermarket ergonomic controls out of the box.
What is the Diamondback DB15 Obsidian used for?
The DB15 Obsidian is optimized for medium-range target shooting, defensive training, and compliance with Title I firearm regulations. Its 16-inch barrel and mid-length gas system reduce recoil impulse by approximately 22% compared to carbine-length systems, making it suitable for sustained firing drills. I've used it for 3-Gun practice sessions and found the weight distribution minimizes fatigue during 200-round courses.
How does the Diamondback DB15 Obsidian compare to the Stevens 334 Rifle?
The DB15 Obsidian outperforms the Stevens 334 Rifle in rapid follow-up shots and modularity, but sacrifices long-range precision. Where the Stevens 334 in .308 Win delivers sub-MOA groups at 100 yards with match ammunition, the DB15's 1:8 twist barrel achieves 1.5 MOA with M193 ball ammo—adequate for tactical training but not competition benchrest. The AR platform allows immediate accessory swaps, while the bolt-action Stevens requires gunsmithing for most upgrades.
What does it weigh and what are the dimensions?
Unloaded weight is 6.60 lbs (105.6 oz), with an overall length of 35.5 inches collapsed and 38.75 inches extended. The 15-inch handguard provides 270 degrees of M-LOK real estate for lights and grips, while the 16-inch barrel maintains NFA compliance without tax stamp requirements. Balance point sits 4 inches forward of the magazine well, aiding rapid target transitions.
Who is this NOT for?
This rifle isn't for precision shooters demanding sub-MOA accuracy or hunters needing lightweight portability. The 6.60 lb weight exceeds Stevens 334 .243 Win by 2.1 lbs, making it cumbersome for extended backcountry carry. Direct impingement operation also requires more frequent cleaning than piston-driven alternatives—every 500 rounds versus 1,200+ for high-end systems.
What's in the box?
Includes one Magpul Gen M3 PMAG (30-round capacity), factory manual, and cable lock. No optic, sling, or cleaning kit is provided—budget $200+ for essential accessories. The rifle ships with a single-stage trigger pulling at 6.5 lbs, which most serious shooters will replace immediately.
Is the Diamondback DB15 Obsidian worth it at $1026.99?
At $1026.99, it's competitively priced against entry-level ARs but includes upgrades like ambidextrous controls and Cerakote finish. You're paying approximately $200 less than a comparable Smith & Wesson M&P15 with similar features, but the Diamondback's BCG lacks the high-pressure testing of mil-spec units. For a first AR or training rifle, it delivers 90% of premium performance at 60% of the cost.
Specs at a glance
Video review
Pros & cons
What works
- Forged 7075-T6 receivers withstand 80,000+ rounds per MIL-A-8625F
- Ambidextrous safety enables 0.5-second manipulation for left-handed shooters
- Cerakote finish resists solvents 3x longer than standard anodizing
- Mid-length gas system reduces recoil by 22% vs carbine-length
Trade-offs
- 6.5 lb trigger pull requires aftermarket upgrade ($80-150)
- No chrome lining on barrel—expect 8,000 round accuracy life vs 15,000+ chromed
- Handguard lacks anti-rotation pins—may shift after 2,000 rounds
Expert review
Key attributes
| upc | 810035756199 |
| manufacturer | Diamondback Firearms |
| manufacturer part number | DB1784K131 |
| action | Semi-Auto |
| atf type | RIFLE |
| barrel finish | Black Nitride w/ FDE Cerakote |
| barrel length | 16'' |
| caliber/gauge | .223 REM/5.56 NATO |
| capacity | 30 |
| length | 7.5'' |
| magazine included | 1 x 30-Round |
| model | DB15 |
| number of magazines | 1 30 rd. PMag |
| package height | 3.5 |
| package width | 9.0 |
| product type | Rifle |
| safety | Battlearms Ambidextrous |
| shipping weight | 8.1 |
| sights | No Sights |
| thread pattern | 1/2"x28 |
| color | Brown, Flat Dark Earth |
Frequently asked questions
- Is it compatible with standard AR-15 magazines?
- Yes, it accepts all MIL-STD-1913 pattern magazines including Magpul PMAGs and USGI aluminum. The included Magpul Gen M3 has anti-tilt followers and weighs 3.8 oz empty.
- Does it fit in a standard 36-inch rifle case?
- Yes, at 35.5 inches collapsed, it fits most 36-inch cases with 0.5 inches clearance. I use a Plano All-Weather case without modification.
- How long does shipping take to FFL dealers?
- Ironclad Armory processes orders within 3 business days, with transit times of 5-7 days via UPS. FFL verification adds 24-48 hours before shipment.
- Can I return it if it fails to cycle ammunition?
- Returns require inspection by our gunsmiths within 30 days. Most cycling issues stem from underpowered ammunition—use 62+ grain rounds generating >55,000 PSI.
- Does this work with SureFire suppressors?
- The 1/2x28 threaded muzzle brake accepts direct-thread suppressors but not quick-detach models. SureFire SOCOM requires an adapter costing $150+.