10.5″ .300 Blackout Barrel – 1:8 Twist, Pistol Gas, 5/8-24
This 10.5-inch .300 AAC Blackout barrel is a U.S.-made AR-platform barrel manufactured from 4150 chrome moly steel with a durable Parkerized finish. It features a 1:8 twist rate, pistol-length gas system, .750″ gas block journal, M4 feed ramps, and 5/8-24 muzzle threads.
Made in the USA from 4150 chrome moly steel, this barrel is built for durability and dependable AR-platform performance. It is back by a limited manufacturer’s warranty against defects.
10.5″ .300 Blackout Barrel Specifications
- Caliber: .300 AAC Blackout (.300 BLK)
- Barrel Length: 10.5″
- Twist Rate: 1:8
- Barrel Material: 4150 Chrome Moly Steel
- Finish: Parkerized
- Barrel Profile: Smooth / HBAR
- Gas System Length: Pistol
- Gas Block Journal: .750″
- Feed Ramps: M4
- Muzzle Thread: 5/8-24
- Country of Manufacture: USA
U.S.-Made 4150 Chrome Moly Construction
Manufactured in the United States from 4150 chrome moly steel, this .300 Blackout barrel is built to provide the strength and durability expected from a quality AR-platform barrel.
The Parkerized exterior finish provides a traditional, durable protective surface, while the smooth HBAR profile provides a substantial barrel profile for a compact 10.5-inch configuration.
Pistol-Length Gas System
This barrel is configured for a pistol-length gas system and accepts gas blocks designed for a .750-inch gas block journal.
M4 feed ramps are incorporated into the barrel extension, providing the feed-ramp configuration commonly used with AR-platform upper receivers.
5/8-24 Muzzle Threads
The muzzle is threaded 5/8-24, the common muzzle-thread specification used with many .30-caliber muzzle devices. Always verify the thread specification, caliber compatibility, and manufacturer requirements of any muzzle device before installation.
Frequently Asked Questions
What caliber is this barrel chambered for?
This barrel is chambered for .300 AAC Blackout, commonly abbreviated as .300 BLK or 300 Blackout.
What is the twist rate?
The barrel has a 1:8 twist rate.
What gas system does this 10.5″ .300 Blackout barrel use?
It is designed for a pistol-length gas system.
What size gas block fits this barrel?
The barrel has a .750-inch gas block journal. Select a gas block designed for a .750″ journal and verify component compatibility before installation.
What muzzle thread does the barrel use?
The muzzle is threaded 5/8-24.
Is this .300 Blackout barrel made in the USA?
Yes. This barrel is manufactured in the United States.
What material is the barrel made from?
It is manufactured from 4150 chrome moly steel and has a Parkerized finish.
Does the barrel include a warranty?
Yes. The barrel is covered by a limited manufacturer’s warranty against defects
Important Compatibility & Legal Notice
Always verify component compatibility and proper installation before use. Barrel length and firearm configuration can affect how a firearm is classified under federal, state, and local law. The purchaser is responsible for ensuring that the completed firearm and its configuration comply with all applicable laws and regulations.
