Diamondback Firearms OEM Replacement Barrel AR Platform AR-15 .300 AAC Blackout 8.5in Heavy Profile Pistol-Length 1-8 Twist 5/8 x 24 Thread Chrome

Name: Diamondback Firearms OEM Replacement Barrel AR Platform AR-15 .300 AAC Blackout 8.5in Heavy Profile Pistol-Length 1-8 Twist 5/8 x 24 Thread Chrome
Brand: Diamondback
Availability: InStock

Diamondback · Barrels

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Best price

$77.49at Ammunition Depot

In stock checked Oct 13, 2026

Buy at Ammunition Depot

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Where to buy

Store	Price	Availability	Buy
Ammunition Depot Best price	$77.49checked Oct 13, 2026	In stock	Buy at Ammunition Depot
Kentucky Gun Co	$79.35checked Oct 13, 2026	In stock	Buy at Kentucky Gun Co
Sportsman's Warehouse	$86.00checked Oct 13, 2026	In stock	Buy at Sportsman's Warehouse
MidwayUSA	$86.00checked Oct 13, 2026	In stock	Buy at MidwayUSA
OpticsPlanet	$95.99Salechecked Oct 12, 2026	In stock	Buy at OpticsPlanet
Battlehawk Armory	$71.76checked Oct 13, 2026	Check store	Buy at Battlehawk Armory
Palmetto State Armory	$72.99checked Oct 13, 2026	Check store	Buy at Palmetto State Armory

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

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Lowest in-stock price in the last 30 days: $77.49 at Ammunition Depot. Dashed line = out of stock. Tracking since Oct 12, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Ammunition Depot	$77.49	$77.49	$77.49
Battlehawk Armory	$71.76	$71.76	$71.76
Kentucky Gun Co	$79.35	$79.35	$79.35
MidwayUSA	$86.00	$86.00	$86.00
OpticsPlanet	$95.99	$95.99	$95.99
Palmetto State Armory	$72.99	$72.99	$72.99
Sportsman's Warehouse	$86.00	$86.00	$86.00

Since Oct 12, 2026.

About this part

The Diamondback Firearms OEM Replacement Barrel AR Platform AR-15 .300 AAC Blackout 8.5in Heavy Profile Pistol-Length 1-8 Twist 5/8 x 24 Thread Chrome is an 8.5" 300 Blackout barrel from Diamondback with a pistol gas system. It's sold by 7 stores (5 in stock), from $71.76 to $95.99. The lowest in-stock price in the last 30 days was $77.49 at Ammunition Depot.

Fits and works with

Caliber: 300 Blackout · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Gas system: Pistol · Handguards
Muzzle thread: 5/8x24 · Muzzle devices
Barrel length: 8.5" · Handguards

Specifications

Manufacturer: Diamondback
Platform: AR-15
Caliber: 300 Blackout
Gas system: Pistol
Barrel length: 8.5"
Thread pattern: 5/8 x 24

From the manufacturer

Diamondback Firearms OEM Replacement Barrel AR Platform AR-15 .300 AAC Blackout 8.5in Heavy Profile Pistol-Length 1-8 Twist 5/8 x 24 Thread Chrome. 5/10/16in black nitride barrel from Diamondback Made of 4150 CMV with a pistol-length gas system. Specifications for Diamondback Firearms OEM Replacement .300 Blackout Barrel: Manufacturer: Diamondback Firearms Color: Black Nitride Finish: Nitride Caliber: .300 AAC Blackout Barrel Profile: Heavy Gas System Length: Pistol Length Barrel Twist Rate: 1-8 Barrel Material: 4150 CMV Steel Gun Make: Diamondback Gun Model: AR-15 Condition: New Package Contents: Diamondback Firearms OEM Replacement .300 Blackout Barrel What firearm models does the manufacturer say Diamondback Firearms OEM Replacement .300 Blackout Barrel is compatible with? The manufacturer suggests that Diamondback Firearms OEM Replacement .300 Blackout Barrel is compatible with AR-15Diamondback Firearms 300P85H50B8R: OEM Replacement Barrel AR Platform AR-15 .300 AAC Blackout 8.5in Heavy Profile Pistol-Length 1-8 Twist 5/8 x 24 Thread Chrome Moly Steel Black Nitride