Diamondback Firearms OEM Replacement Barrel AR Platform AR-15 .300 AAC Blackout 16in Heavy Profile Pistol-Length 1-8 Twist 5/8 x 24 Thread Chrome Moly
$99.99 at Ammunition Depot · 6 stores
In stock
AT3 Tactical 300 Blackout Medium Profile 6 Inch AR-15 Barrel Black
No ratings yetBest price
$100.00at OpticsPlanet
Out of stock Sale checked Oct 22, 2026
In stock now instead
- Diamondback Firearms OEM Replacement Barrel AR Platform AR-15 .… $99.99at Ammunition Depot
- Moriarti AR-15 .300 AAC Blackout Threaded Barrel 5 inch Medium … $105.99at OpticsPlanet
- Moriarti AR-15 .300 AAC Blackout Threaded Barrel 7.5 inch Mediu… $107.99at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $100.00Salechecked Oct 22, 2026 | Out of stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Similar barrels in stock
This part is out of stock at every store we track. These similar barrels are in stock, with today's prices.
Moriarti AR-15 .300 AAC Blackout Threaded Barrel 5 inch Medium Micro Gas System 1-7 Twist 5/8x24 Nitride Black
$105.99 at OpticsPlanet
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Moriarti AR-15 .300 AAC Blackout Threaded Barrel 7.5 inch Medium Micro Gas System 1-7 Twist 5/8x24 QPQ Corrosion Resistant Black
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Contour 300BLK 16" Medium Profile Pistol 1-7 Twist Thread Black
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TRYBE Defense 16 in Blackout Government Profile AR Carbine Barrel .300 5/8X24 Threads Nitride Black
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300BLK 10.5" Medium Profile Pistol 1-7 Twist Thread Black
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Price history
Dashed line = out of stock. Tracking since Oct 16, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $100.00 | $100.00 | $100.00 |
Since Oct 16, 2026.
About this part
The AT3 Tactical 300 Blackout Medium Profile 6 Inch AR-15 Barrel Black is a 6" 300 Blackout barrel from At3 Tactical. One store lists it, OpticsPlanet at $100.00.
Fits and works with
- Caliber
- 300 Blackout · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Barrel length
- 6" · Handguards
Specifications
- Manufacturer
- At3 Tactical
- Color
- Black
- Platform
- AR-15
- Caliber
- 300 Blackout
- Barrel length
- 6"
From the manufacturer
AT3 Tactical 300 Blackout Medium Profile 6 Inch AR-15 Barrel Black. 5 Inch .300 Blackout Barrel makes a great choice for your short heavy-hitting pistol or SBR AR-15 builds. Made from 4150 CMV steel per Mil-B-11595E and finished with a durable black nitride treatment this barrel holds up under pressure with excellent corrosion resistance. This barrel fits all your standard AR-15 uppers if youre going for a fresh build with M4 feed ramps for reliability. Specifications for AT3 Tactical .300 Blackout Medium Profile AR-15 Barrel: Manufacturer: AT3 Tactical Color: Black Caliber: .300 AAC Blackout Barrel Profile: Medium Gun Make: AR Platform Gun Model: AR-15 Package Contents: AT3 Tactical .300 Blackout Medium Profile AR-15 Barrel What firearm models does the manufacturer say AT3 Tactical .300 Blackout Medium Profile AR-15 Barrel is compatible with? The manufacturer says that AT3 Tactical .300 Blackout Medium Profile AR-15 Barrel is compatible with AR-15AT3 Tactical AT3-300-6: 300 Blackout Medium Profile 6 Inch AR-15 Barrel Black
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