DB15 Complete Upper — 16" .300 Blackout
$549.99
Suggested Retail Price
Diamond Series .300 BLK upper with 16" barrel optimized for both supersonic and subsonic loads. Perfect for suppressed builds with Ventra suppressors.
Best For
Specifications
.300 AAC Blackout
16"
4150 CMV, Nitride Treated
1:7
Pistol-Length
15" Diamond S-Rail M-LOK
Forged 7075-T6, Type III Anodized
Full-Auto Rated, Nitride, MPI Tested
A2 Flash Hider, 5/8-24 Thread
4.5 lbs
Black Nitride
Key Features
Optimized for suppressed and unsuppressed use
1:7 twist stabilizes 220gr subsonic loads
Diamond Series anti-rotation S-Rail handguard
Compatible with all Ventra 30 Cal suppressors
Pistol-length gas for reliable subsonic cycling
Overview
Purpose-built for shooters who demand versatility, the .300 Blackout Diamond Series upper transitions seamlessly between supersonic hunting loads and whisper-quiet subsonic rounds through a Ventra suppressor.
The 16" barrel features a pistol-length gas system tuned for reliable cycling with both supersonic and subsonic ammunition — no adjustable gas block required (though one is recommended for suppressed use). The 1:7 twist rate stabilizes heavy 220gr subsonic projectiles for maximum suppressor performance.
Diamond Series features include the anti-rotation S-Rail handguard, enhanced port door, and Diamondback's signature Diamond trigger guard.
Compatible Components
These products are designed to work with the DB15 Complete Upper — 16" .300 Blackout.
Continue Your Build
Explore all categories or use our guided builder to find the perfect components for your mission.