Faxon Sentinel 16” 8.6 BLK AR-10 Rifle

(4 reviews)
Current Stock:

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 Modified Big Gunner Profile Barrel. The Faxon Sentinel is backed by Faxon's Lifetime Guarantee.

Faxon Sentinel in 8.6 BLK rifles are optimized for supersonic ammunition. Use of subsonic ammunition may require adjustment to rifle for optimal performance.


  • 7075 Billet Aluminum Receiver Set
  • Faxon 16" 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 & Dimensions:

  • Weight: 9.33 lbs
  • Length: 36"
  • Depth: 7.5"
  • Width: 2"


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.


We have noticed inconsistencies with 8.6 BLK ammunition available on the market. Ammunition that does not match cartridge print below cannot be guaranteed to function in our rifles or barrels.


Using cartridges made specifically for semi-auto rifles may cause light primer strikes in bolt action rifles due to hard primers.


If you have any questions, please contact customerservice@faxonfirearms.com.

8.6 BLK Cartridge Drawing


Note: Cannot be shipped to CA, CT, DC, HI, IL, MD, MA, NJ, or NY state



  • 4
    Sentinel 16" 8.6

    Posted by Ron on Dec 4th 2023

    This rifle is awesome. From the look of the gun which is badass to the way it functions, the trigger is smooth, and shooting it is a blast. I have only got to shoot approximately 90 rounds through it. The only thing I would change is the buttstock. Now I cannot wait to get the suppressor ordered. Awesome product

  • 5
    Sentinel 16" 8.6BLK AR-10

    Posted by JP on Apr 29th 2023

    Took a little bit to get factory ammo, and held off until I had these in had to compare my handloads to. All rounds shot unsuppressed. 45F, first 45 rounds thru the rifle. 3-shot groups of factory Gorilla 210g Barnes TSX, 2.0”, 1.75”, 1.5”. Average 1.75”. Cycled flawlessly. Factory Gorilla 285g Fracturing Subsonic. 11” drop from what I had zero’d the TSX at. Wasn’t too surprised at this. This ammo did not cycle the bolt properly. 3 fail to feed, 2 stove pipes. Again, I was shooting unsuppressed, so I haven’t given up on this factory load. 5-shot group 2.0”. Switched to handloads: Hornady brass, CCI 200, Accurate 1680 pushing Gorilla 285g subsonic fracturing projectile. Ran 3 different powder loads. All cycled flawlessly. All 3 loads hit paper similar to the TSX: 23.0g, 5-shot group 2”. 23.5g, 5-shot group 2”. 24.0g 10-shot group 1.75” For those balking at group size, these were the first rounds thru the gun. She hasn't settled in yet. She shoots better than my numbers show - I know the shots I pulled.

  • 4
    Sentinel 16

    Posted by Kevin Schwendiman on Aug 22nd 2022

    Beautiful rifle. I can’t give an opinion on how it functions as there is no ammunition available. I will update my review after I have a chance to shoot it a few times.

  • 5
    Faxon sentinel 16” 8.6blk

    Posted by Jose Figueroa on Aug 15th 2022

    Awesome fit and finish, unable to comment on accuracy and shootability due to ammo shortage