Diamondback DB15 .300 Blackout 16″ M-LOK 30rd
$917.84
Get a reliable .300 Blackout AR-15 with a 16″ nitride barrel, free-float M-LOK handguard, and Magpul furniture. The Diamondback DB15 .300 Blackout 16″ M-LOK 30rd ships with a Gen 3 PMAG and cycles both supersonic and subsonic loads right out of the box.
Description
The Diamondback DB15 in .300 AAC Blackout is a purpose-built AR-style rifle that balances short-range performance with accessory compatibility. The diamondback db15 .300 blackout 16″ m-lok 30rd features a 16″ heavy 4150 chrome-moly barrel with a black nitride finish and a pistol-length gas system for reliable function with common .300 Blackout loads. Built on forged 7075-T6 aluminum receivers in Diamondback’s Black Gold finish, the platform includes a 15″ M-LOK handguard and Magpul furniture for practical ergonomics and modularity. The rifle ships with a 30-round Gen 3 .300 BO PMAG for extended capacity during range and training sessions.
| Manufacturer | Diamondback Firearms |
|---|---|
| Model | DB15 .300 Blackout |
| Material | Forged 7075-T6 aluminum receivers, 4150 chrome-moly barrel |
| Compatibility | All .300 Blackout ammunition, standard AR-15 accessories |
| Finish | Black Gold (proprietary anodized finish) |
| Weight | 6.8 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- 16″ Heavy Barrel with Black Nitride — The 4150 chrome-moly steel and nitride finish resist wear and corrosion, keeping accuracy consistent over long strings of fire without adding unnecessary weight.
- Pistol-Length Gas System — Tuned specifically for .300 Blackout loads, this system cycles supersonic and subsonic ammunition reliably, reducing felt recoil and muzzle rise.
- 15″ M-LOK Handguard — The free-float design gives you a solid mounting surface for lights, grips, and lasers while keeping the barrel free for consistent accuracy.
- Magpul CTR Stock and MOE Grip — These are proven, hard-use components that lock up tight and offer a comfortable, repeatable cheek weld and hand position.
- 30-Round Gen 3 .300 PMAG — Ships with a dedicated .300 Blackout magazine that feeds reliably and holds up to hard use on the range or in training.
Who It’s For
This rifle is built for the traditional shooter who wants a .300 Blackout platform that runs without fuss. It suits hunters working thick cover where shots stay inside 200 yards, home defenders who value barrier-blind terminal performance, and shooters who appreciate a clean, no-nonsense build with quality components. If you prefer to spend your time shooting rather than tinkering, this DB15 is a solid choice.
Pros & Cons
- Pros: Reliable gas system for both supersonic and subsonic loads; free-float M-LOK handguard for accessory mounting; Magpul furniture is durable and ergonomic; nitride barrel finish resists rust and fouling; lightweight enough for carry in the field.
- Cons: The pistol-length gas system can be a bit gassy with some suppressed subsonic loads, so you may want to consider an adjustable gas block or a heavier buffer if you plan to run a suppressor regularly.
Comparison
| Feature | Diamondback DB15 .300 Blackout | Geissele Super Duty .300 Blackout | Lone Wolf Distributors AR-15 .300 Blackout |
|---|---|---|---|
| Barrel Length | 16″ | 16″ | 16″ |
| Gas System | Pistol-length | Carbine-length | Pistol-length |
| Handguard | 15″ M-LOK | 15″ M-LOK | 15″ M-LOK |
| Stock | Magpul CTR | Geissele Super 42 | Magpul MOE |
| Price | $819.50 | $1,999.00 | $1,149.00 |
| Weight | 6.8 lbs | 7.2 lbs | 7.1 lbs |
The Diamondback DB15 hits a sweet spot between price and performance. The Geissele Super Duty is a premium build with a carbine gas system and a higher price tag, while the Lone Wolf build uses similar components but costs more for a comparable setup. For the shooter who wants a reliable .300 Blackout without paying for a brand name, the DB15 delivers.
FAQ
Does this rifle cycle subsonic .300 Blackout ammunition reliably?
Yes. The pistol-length gas system is designed to cycle both supersonic and subsonic loads common to .300 Blackout. Per Diamondback specs, the DB15 functions with standard factory subsonic ammunition when using a suppressor or with heavier buffer weights if needed.
What magazines are included with the Diamondback DB15 .300 Blackout?
It ships with one 30-round Gen 3 PMAG specifically designed for .300 Blackout. This magazine has a different follower and internal geometry than standard 5.56 PMAGs to ensure reliable feeding with the .300 Blackout cartridge.
Can I mount a suppressor on this barrel?
Yes, the 16″ barrel has a standard 5/8×24 threaded muzzle. You can attach most .30-caliber suppressors. Keep in mind that the pistol-length gas system may produce more gas blowback when suppressed; an adjustable gas block or heavier buffer can help tune the action.
Is this rifle legal for hunting in states that restrict magazine capacity?
It depends on your state. The rifle ships with a 30-round magazine, which is legal in many states, but some states have magazine capacity limits. You can use standard 10-round .300 Blackout magazines for compliance.
What is the barrel twist rate on the DB15 .300 Blackout?
The barrel has a 1:8 twist rate, which stabilizes both lightweight supersonic bullets (110-125 grains) and heavier subsonic bullets (200-220 grains) commonly used in .300 Blackout.
Trust & Delivery
- ✅ Nationwide delivery to all 50 states
- ✅ Ships within 1-2 business days
- ✅ 30-day return policy
- ✅ Secure checkout with encrypted payment
Last updated: April 2026
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