Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Enjoy free shipping during the holidays! Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC and to all U.S. Military APO/FPO/DPO addresses.

Enjoy Our Extended FREE RETURNS

We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later). We'll even cover the cost of return shipping. Learn more about our Return Policy.

Shopping Cart
Government Restriction Government Restriction
Questions & Answers
What is thread pitch and what is twist rate? Says it’s a 1:7 on picture but description says 1:8. Manufacturer Answer

The 300BLK HEDP Barrel has a standard 5/8x24 thread pitch and is primarily offered in a 1:7-inch twist rate. Your observation that the picture indicates a 1:7 twist is correct for the standard 9.5-inch HEDP barrel. This faster twist rate is ideal for stabilizing both lightweight supersonic and heavier subsonic .300 BLK loads, especially when using a suppressor.

by Griffin Armament, Manufacturer, December 10, 2025
Is gas block adjustable Manufacturer Answer

Unfortunately the included Gas Block is not adjustable.

by Griffin Armament, Manufacturer, May 21, 2025
Customer Reviews
Most Recent Reviews
great barrell by Jay, Verified Owner, October 25, 2024
Looks good and works perfectly! Great upgrade if you want a new barrel!
Read 1 Review
Finish: Black Nitride Caliber: .300 AAC Blackout Barrel Length: 9.5 inBarrel Profile: M4 Gas System Length: Pistol Length Barrel Twist Rate: 1-8 Condition: New

Code: 28N-ATB-G300HEDPB-HE95300B

MPN: HE95300B

UPC: 791154082720

List: $295.00Save $14.75
$280.25

Product Info for Griffin Armament Griffin 300BLK HEDP Barrel w/Gas Block

Give your rifle some extra durability and performance by upgrading to this Griffin Armament 300BLK HEDP Barrel w/ Gas Block. Griffin Armament built these Rifle Barrels from 416R stainless steel for maximum hardness with a black nitride finish, and these Griffin Armament HEDP Rifle Barrels are hand lapped to ensure each one is built to the highest quality possible. The Griffin Armament 300 BLK HEDP Barrel w/ PRIMO Gas Block features a medium diameter between the chamber and gas block to ensure low-bullets are shifted when firing with a suppressor. Plus, there's a polished M4 feed ramp and gas ports to ensure smooth feeding, chambering, and extraction. These barrels are all paired with a 416R low profile PRIMO Gas Block which has a medium profile for reliable function with suppressors and is capable of handling both supersonic and subsonic ammunition. Install this Griffin Armament 300 BLK HEDP Barrel w/ PRIMO Gas Block to get one of the best barrels the shooting industry has to offer.image

Specifications for Griffin Armament Griffin 300BLK HEDP Barrel w/Gas Block:

Manufacturer: Griffin Armament
Finish: Black Nitride
Caliber: .300 AAC Blackout
Barrel Length: 9.5 in
Barrel Profile: M4
Gas System Length: Pistol Length
Barrel Twist Rate: 1-8
Condition: New

Package Contents:

  • Griffin Armament Griffin 300BLK HEDP Barrel w/Gas Block

Griffin Armament Griffin 300BLK HEDP Barrel w/Gas Block Orderable Models

List of Orderable Models

  • Griffin Armament 9.5 inch 300BLK HEDP Barrel w/Gas Block, HE95300B , MPN: HE95300B , UPC: 791154082720 , Code: 28N-ATB-G300HEDPB-HE95300B
Compare (0)