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Diamondback
Overview
The Diamondback Firearms .300 Blackout AR-15 barrel features a 10.5-inch heavy profile, designed specifically for the .300 Blackout caliber. With a pistol-length gas system and a 1:8 twist rate, this barrel provides reliable performance and stability for subsonic and supersonic ammunition alike. Commonly found in pistol builds, this barrel is ideal for those looking to maximize the versatility of their .300 Blackout setup.
Specifications
Diamondback Firearms .300 Blackout AR-15 Barrel - Nitride - 10.5"
Build history on GunPartPicker
Builders have added the Diamondback Firearms .300 Blackout AR-15 Barrel - Nitride - 10.5" to their builds on GunPartPicker. Since April 2026, it ranks #94 of the 1,043 barrels builders have added. Builds with this barrel are nearly all chambered in 300 Blackout, nearly all on pistol-length gas, and nearly all AR-15.
It was out of stock everywhere we track every time we checked in October 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $81 at BattleHawk Armory for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Read the guide: AR-15 Barrel Length & Brand Report →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the builds that include this one
Wilson Combat AR-15 Billet Upper Receiver
Aero Precision M4E1 Stripped AR-15 Lower Receiver - FDE Cerakote
Maximize Your AR-15's Potential with Tacfire's 15" ACE M-LOK Handguard - Black Excellence - HG20-15
Breek Arms Warhammer MOD2 AR-15 Ambidextrous Charging Handle - FDE
ALG Defense Qms AR-15 Trigger Set
FAXON Chameleon 5.56 Complete Nitride Bolt Carrier Group - FF556BCGCNITRIDE-NCR
Builds Featuring This Part
See all builds →Builds in the community that include the Diamondback Firearms .300 Blackout Ar-15 Barrel - Nitride - 10.5"
| Build | Parts | Total |
|---|---|---|
 | 23 | $2427.64 |
 | 22 | $2087.78 |
 | 23 | $1475.75 |
 | 14 | $679.62 |
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