The Faxon Sentinel is an AR-style rifle chambered in 8.6 BLK with a 12-inch barrel, black nitride finish, and an M-LOK handguard. It has a 20+1 round capacity and is built on a semi-automatic AR-10 platform. 
 

Key Specifications 

• Brand: Faxon 
• Model: Sentinel 
• Caliber: 8.6 BLK 
• Action: Semi Auto 
• Capacity: 20+1 
• Barrel Length: 12 in 
• Color/Finish: Black Nitride 
   

Detailed Features 

• 12-inch barrel with black nitride finish 
• M-LOK handguard for accessory attachment 
• 8.6 BLK chambering on an AR-style platform 
• 20+1 round capacity 
• Buffer tube configuration

Owners of the Faxon Sentinel in 8.6 BLK cite the 12-inch barrel as a practical middle ground, long enough to extract reasonable velocity from the round without crossing into unwieldy territory. The black nitride finish gets consistent praise for durability and low maintenance.

The M-LOK handguard is a point of appreciation for those who run lights or grips, and the Sentinel's fit tends to satisfy buyers who have handled Faxon barrels before. Trigger feel is described as acceptable for a factory AR-pattern trigger, though dedicated shooters often replace it.

At its price point the Sentinel competes with other boutique 8.6 BLK builds, and most owners feel the machining justifies the cost. A common note is that 8.6 BLK ammunition remains less available than common rifle calibers, so buyers plan accordingly before committing to the platform.