The Diamondback DB15 Obsidian 5.56 NATO 16-inch M-LOK AR Rifle is a lightweight, ready-to-run AR-platform rifle built for shooters who want reliability without extra weight. At just 6.60 pounds, it pairs forged 7075-T6 aluminum receivers with a 16-inch 4150 CrMoV black nitride barrel and a mid-length gas system. The 15-inch M-LOK handguard, Magpul CTR stock, and ambidextrous controls make this a solid choice for family range days, youth shooters, and anyone stepping into the AR world for the first time.
| Manufacturer | Diamondback Firearms |
|---|---|
| Model | DB15 Obsidian |
| Material | Forged 7075-T6 aluminum receivers, 4150 Chrome-Moly-Vanadium barrel |
| Compatibility | Standard AR-15 lower and upper parts (per manufacturer specs) |
| Finish | Black nitride barrel, hardcoat anodized receivers |
| Weight | 6.60 pounds (per manufacturer specs) |
| Condition | New |
Key Features
- Lightweight Build — At 6.60 pounds, this rifle is easy for smaller shooters to handle and carry through a day of training without fatigue.
- Mid-Length Gas System — Smoother cycling and less felt recoil compared to carbine-length systems, which helps newer shooters stay on target.
- Magpul Furniture — The Magpul CTR stock and MOE-K2 grip offer a solid cheek weld and a more vertical grip angle, reducing wrist strain for all hand sizes.
- 15-Inch M-LOK Handguard — Anti-rotation design keeps accessories like lights or grips locked in place, while the slim profile fits smaller hands comfortably.
- Ambidextrous Controls — Safety selector and bolt catch work for left- and right-handed shooters, making it a great family rifle.
Who It’s For
This rifle is built for families, youth shooters, and beginners who want a reliable, no-nonsense AR that’s easy to learn on. The light weight and Magpul upgrades make it comfortable for smaller-framed shooters, while the 1:8 twist barrel handles both 55-grain plinking ammo and 62-grain defensive loads. It’s also a smart choice for first-time AR buyers who want a quality firearm without breaking the bank.
Pros & Cons
- Pro: Comes ready to shoot out of the box with one Magpul Gen M3 30-round magazine included.
- Pro: Black nitride barrel finish is corrosion-resistant and easier to clean than standard phosphate.
- Con: The DB Obsidian Muzzle Brake is effective at reducing muzzle rise but can be loud for shooters next to you on the line — ear protection is a must.
Comparison
| Feature | Diamondback DB15 Obsidian | Zev Technologies OZ9 | Geissele Super Duty |
|---|---|---|---|
| Weight | 6.60 lbs | 7.2 lbs | 6.9 lbs |
| Barrel Material | 4150 CrMoV, black nitride | 416R stainless, black nitride | 4150 CrMoV, chrome-lined |
| Handguard | 15-inch M-LOK, anti-rotation | 15-inch M-LOK, aluminum | 13.5-inch M-LOK, aluminum |
| Gas System | Mid-length | Carbine-length | Mid-length |
| Price | $980.47 | $1,700+ | $1,800+ |
FAQ
What is the barrel twist rate on the Diamondback DB15 Obsidian?
The barrel has a 1:8 right-hand twist, which stabilizes a wide range of bullet weights from 55 to 77 grains.
Does this rifle come with a magazine?
Yes, it ships with one Magpul Gen M3 30-round magazine.
Is the Diamondback DB15 Obsidian good for left-handed shooters?
Yes, it has ambidextrous controls including the safety selector and bolt catch, so it works well for both right- and left-handed shooters.
What type of muzzle device is on this rifle?
It features the DB Obsidian Muzzle Brake with 1/2×28 threads, designed to reduce recoil and muzzle rise.
Can I attach a suppressor to this rifle?
The barrel is threaded 1/2×28, so most 5.56 suppressors will attach directly. Note that the muzzle brake is not a quick-detach mount.
Why Buy From Us
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Looking for more options? Check out our AR Rifles or AR-15 Uppers for builds. Also see our Magpul Accessories to customize your rifle.
Last updated: April 2026
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This Diamondback DB15 Obsidian 5.56 NATO 16-inch M-LOK AR Rifle is ideal for shooters looking to buy guns online with confidence. Built with precision engineering and tested performance, it’s a top-tier choice whether you're looking for home defense, sport shooting, or a trusted everyday carry.
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