Diamondback Firearms Carbon DB15 .300 Blackout 16" - AR-15 Rifle

Subsonic stealth or supersonic punch — the Diamondback Firearms Carbon DB15 .300 Blackout 16" handles both. Built around .300 Blackout, it transitions effortlessly between suppressed and standard use without changing magazines or lowers.

The Diamondback Firearms Carbon DB15 .300 Blackout 16" brings .300 Blackout capability to a semi-automatic AR-15 rifle, using a direct impingement operating system designed for dependable function in any condition.

Built for Suppressors: The .300 Blackout cartridge was engineered from the ground up for suppressed use. Subsonic loads run quietly and cycle reliably — the standard for an effective suppressed AR-15.

Supersonic Versatility: Swap to supersonic loads and this platform delivers hard-hitting terminal performance at practical carbine ranges — making it a genuinely dual-purpose rifle for hunting and defense.

Lower Compatibility: Standard AR-15 lower receivers and STANAG magazines work without modification. Only the barrel and BCG are caliber-specific, protecting your existing investment.

Effective Hunting Caliber: Supersonic .300 BLK loads produce enough energy for deer and medium game at moderate ranges, extending the practical role of this AR-15 beyond range and defense use.

• Caliber: .300 Blackout
• Barrel Length: 16"
• Gas System: Direct Impingement
• Handguard: 15" M-Lok Free-Float
• Muzzle Threading: 1/2x28
• Magazine Capacity: 30-Round
• Finish: Type III Hardcoat Anodized
• Origin: Made in the USA

Uses standard AR-15 lower receivers and STANAG magazines. Shares lower receiver and magazine compatibility with 5.56 platforms — only barrel and BCG are caliber-specific.

Machined from 7075 aluminum and coated with Type III Hardcoat Anodized, the receiver set offers durable protection against wear and environmental exposure while maintaining precise fit between components.

Ideal for suppressor-ready home defense builds, close-range hunting applications, and tactical training. Subsonic loads deliver a hearing-safe shooting experience; supersonic loads extend practical range.

Diamondback Firearms builds a full range of AR-15 rifles with an emphasis on reliability and value, offering solid performance at competitive price points. Made in the USA.