Faxon Sentinel AR-10 — 8.6 BLK Goodness

If you haven’t heard of the 8.6 BLK, you might have been living under a rock. It’s a cartridge that was designed by Kevin Brittingham and has immediately gained popularity. Some people call it the 8.6 Creedmoor, but it’s officially the 8.6 BLK. Faxon Firearms is manufacturing a line of guns chambered in the cartridge, so if you’re interested in adding a new cartridge to your collection, you’re in luck.

 Faxon Sentinel AR-10 in 8.6 BLK
The Faxon Sentinel AR-10 line includes a trio of guns chambered in the cartridge. (Photo credit: Faxon Firearms)

Faxon Firearms released details of their Sentinel lineup:

It’s all in the name…Sentinel. A Sentinel is a guard whose job it is to stand and keep watch. The Faxon Firearms Sentinel will do just that…keep watch…overwatch, that is.

The AR-15, no doubt, is America’s favorite rifle. But even America’s rifle has its limitations. The primary limitation is that it cannot handle long-action cartridges such as the 8.6 BLK.

The standard 5.56 NATO cartridge loses a lot of velocity and power at a distance. So to get over that hurdle but still have the same feel of an AR-15, you’re looking at an AR10.

The AR10 has the same look and feel as the AR-15. But you can now shoot longer action cartridges such as the 8.6 BLK, 308 WIN, and 6.5 Creedmoor.

The Sentinel 8.6 BLK, part of Faxon’s Summit Line of firearms, boasts a billet aluminum receiver set, G3 Aluminum Streamline M-LOK Handguard, new 8.6 BLK MuzzLok Muzzle Device, and the impressive 1:3 twist Big Gunner Profile Barrel. Faxon’s Lifetime Guarantee also backs the Faxon Sentinel.

The Faxon Firearms Sentinel AR-10 Rifle in 8.6 BLK
The Faxon Firearms Sentinel AR-10 Rifle promises to be durable, reliable, and accurate. (Photo credit: Faxon Firearms)

Specifications of Sentinal AR-10 Rifle in 8.6 BLK

  • 7075 Billet Aluminum Receiver Set
  • Faxon 16-inch 1:3 Twist Big Gunner Profile 8.6 BLK Barrel
    • 4150 CMV, Nitrided
  • Faxon MuzzLok 8.6 BLK 3-Port Muzzle Brake
  • Faxon G3 Aluminum Streamline M-LOK Handguard
  • Faxon G2 Superfinished AR-10 BCG
  • Faxon AR-10 Height Gas Block
  • B5 Precision Collapsible Stock
  • Faxon Trigger by Rise Armament
  • B5 Pistol Grip
  • Ambi Charging Handle
  • Ambi Safety Selector
  • ​​​​​​​Carbine-Length Gas System

Weights and Dimensions

  • Weight: 9.33 lbs
  • Length: 36 inches
  • Depth: 7.5 inches
  • Width: 2 inches
The Faxon Firearms Sentinel AR-10 Pistol pictured here has an 8-inch barrel. (Photo credit: Faxon Firearms)

Specifications of the Sentinel AR-10 Pistol Pictured Above

  • 7075 Billet Aluminum Receiver Set
  • Faxon 8-inch 1:3 Twist Big Gunner Profile 8.6 BLK Barrel
    • 4150 CMV, Nitrided
  • Faxon MuzzLok 8.6 BLK 3-Port Muzzle Brake
  • Faxon G3 Aluminum Streamline M-LOK Handguard
  • Faxon G2 Superfinished AR-10 BCG
  • Faxon AR-10 Height Gas Block
  • SBA3 Pistol Brace
  • Faxon Trigger by Rise Armament
  • B5 Pistol Grip
  • Ambi Charging Handle
  • Ambi Safety Selector
  • ​​​​​​​Pistol-Length Gas System

Weights and Dimensions

  • Weight: 6.59 lbs
  • Length: 24.5 inches
  • Depth: 7.5 inches
  • Width: 2 inches
Faxon Firearms Sentinel AR-10
The Faxon Firearms Sentinel AR-10 line includes one rifle and two pistols. (Photo credit: Faxon Firearms)

As mentioned before, all three guns are chambered in the cartridge. The two pistols come with pistol braces while the rifle has an adjustable stock. The 8.6 BLK is not yet a SAAMI-official cartridge, and as a result, Faxon Firearms included this disclaimer on their website:

ADVISORY: At the time of product launch, 8.6 BLK is not of SAAMI spec. Early production ammunition may be inconsistent or cause malfunction of firearm.

What do you think of the cartridge and the Faxon Firearms Sentinel line? Tell us what you think in the comments.

Kat Ainsworth Stevens is a long-time outdoor writer, official OGC (Original Gun Cognoscenti), and author of Handgun Hunting: a Comprehensive Guide to Choosing and Using the Right Firearms for Big and Small Game. Der Teufel Katze has written for a number of industry publications (print and online) and edited some of the others, so chances are you've seen or read her work before, somewhere. A woman of eclectic background and habits, Kat has been carrying concealed for over two decades, used to be a farrier, and worked for a long time in emergency veterinary medicine. She prefers big bores, enjoys K9 Search & Rescue, and has a Master's Degree in Pitiless Snarkastic Delivery.

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