Diamondback DB15 Pistol .300 AAC Blackout SBA5 30rd
Specs at a glance
About this product
The Diamondback DB15 Pistol in .300 AAC Blackout with the SBA5 brace and a 30-round PMAG is a compact AR-platform pistol built for short-range work and suppressed use. Chambered in .300 Blackout, it pairs forged 7075 T-6 aluminum receivers with a Magpul MOE K2 grip and an SB Tactical SBA5 pistol brace for solid control in a small package. This DB15 ships with a 30-round Magpul PMAG, making it ready to run right out of the box. At 6.25 pounds, it balances well for its size.
| Manufacturer | Diamondback Firearms |
|---|---|
| Model | DB15 Pistol .300 AAC Blackout |
| Material | Forged 7075 T-6 Aluminum (upper and lower receivers) |
| Compatibility | Standard AR-15 lower parts, .300 Blackout magazines |
| Finish | Black Anodized |
| Weight | 6.25 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- Forged 7075 T-6 Aluminum Receivers — These are mil-spec strength receivers that hold up to heavy use and keep the action tight over thousands of rounds.
- .300 AAC Blackout Chambering — You get subsonic and supersonic load versatility, making this ideal for suppressed shooting or hunting without a can.
- SB Tactical SBA5 Pistol Brace — Adjustable and stable, this brace gives you a cheek weld similar to a carbine stock without the NFA paperwork.
- Magpul MOE K2 Grip — A more vertical grip angle reduces wrist fatigue and improves trigger finger reach, especially with shorter barrels.
- M-LOK Handguard — Lightweight and modular, you can attach lights, lasers, or foregrips without adding bulk or weight.
Who It's For
This Diamondback DB15 is for shooters who want a compact, maneuverable pistol that can handle home defense, truck gun duty, or range plinking with subsonic loads. New gun owners will appreciate the simple controls and Magpul furniture, while experienced shooters will like the .300 Blackout versatility and SBA5 brace adjustability.
Pros & Cons
- Pro: Lightweight at 6.25 lbs, easy to carry and shoot one-handed.
- Pro: Ships with a 30-round Magpul PMAG, saving you $15-20.
- Con: The stock trigger has some creep — many owners swap it for a Geissele or Timney drop-in for a crisper break.
Comparison
| Feature | Diamondback DB15 Pistol .300 Blackout | Zev Technologies OZ9 | Geissele Super Duty Pistol |
|---|---|---|---|
| Caliber | .300 AAC Blackout | 9mm | 5.56 NATO |
| Barrel Length | 10.5" (approx) | 4.5" | 11.5" |
| Weight | 6.25 lbs | 1.8 lbs | 6.8 lbs |
| Brace | SB Tactical SBA5 | None (handgun) | SB Tactical SBA3 |
| Price | $980.47 | $1,899 | $1,699 |
| Best For | Budget .300 Blackout pistol | Competition 9mm | Duty-grade 5.56 |
What is the barrel length on the Diamondback DB15 Pistol .300 Blackout?
The barrel length is approximately 10.5 inches, which is standard for .300 Blackout pistols to stabilize both subsonic and supersonic loads effectively.
Does this come with any sights?
No, the DB15 ships without iron sights or optics. You'll need to add your own — many customers pair it with a red dot like a Holosun or Sig Romeo5.
Can I run this suppressed?
Yes, .300 Blackout is designed for suppressed use. The 10.5-inch barrel works well with most .30-caliber suppressors, and the SBA5 brace keeps the overall length manageable.
What magazines are compatible?
Standard AR-15 .300 Blackout magazines work fine — the included 30-round Magpul PMAG is a great start. Avoid 5.56 magazines for .300 Blackout as the different feed geometry can cause issues.
Is this legal in my state?
Check your local laws regarding pistol braces and overall length — some states have restrictions on AR pistols. We ship to all 50 states, but you're responsible for compliance.
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Last updated: April 2026
See more AR Pistols or .300 Blackout Firearms.