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

Purpose-built for the full range of what .300 Blackout can do, the Diamondback Firearms Carbon DB15 .300 Blackout 16" moves seamlessly from quiet subsonic use to full-power supersonic performance — a genuinely versatile AR-15 build.

The Diamondback Firearms Carbon DB15 .300 Blackout 16" is a semi-automatic AR-15 rifle chambered in .300 Blackout, built around direct impingement operation for reliable cycling on the AR-15 platform.

Quiet Subsonic Performance: Paired with a suppressor, subsonic .300 Blackout ammunition makes this one of the quietest centerfire rifles available — hearing-safe shooting without sacrificing reliability.

Full-Power Supersonic Option: When suppression is off the table, supersonic loads deliver genuine ballistic performance — substantially more energy than 5.56 at short to medium range.

Simple AR-15 Integration: This caliber requires only a barrel and BCG change from a standard 5.56 setup. Lowers, stocks, grips, and magazines remain the same — no new platform required.

Hunting and Defense in One: The .300 Blackout occupies a unique niche: subsonic for quiet defense and pest work, supersonic for hunting and extended-range use from the same rifle.

• 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: FDE Cerakote
• Origin: Made in the USA

Compatible with standard AR-15 lower receivers and accepts standard STANAG magazines. Requires a .300 Blackout-specific barrel and BCG — mag and lower remain the same as a 5.56 build.

Receivers are machined from 7075 and finished with FDE Cerakote, providing lasting corrosion and wear resistance under regular use and varied environmental conditions.

A natural choice for suppressor owners, hunters in close-cover terrain, and shooters who want hard-hitting performance in a compact package. Supersonic and subsonic loads both perform as designed.

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.