The Faxon Firearms Sentinel is an AR-10-pattern semi-automatic pistol chambered in .308 Win with a 13.9-inch pinned barrel and a 20+1 capacity. It ships with an M-LOK handguard and an optics-ready upper. The finish is anodized black throughout. 
 

Key Specifications 

• Brand: Faxon Firearms 
• Model: Sentinel 
• Caliber: .308 Win 
• Action: Semi Auto 
• Capacity: 20+1 
• Barrel Length: 13.9 in 
• Color/Finish: Anodized Black 
   

Detailed Features 

• 13.9-inch pinned barrel in an AR-10 platform 
• M-LOK handguard for accessory attachment 
• Optics-ready upper receiver 
• 20+1 round capacity 
• Anodized black finish on all components

Owners of the Faxon Sentinel generally appreciate the compact .308 package. The 13.9-inch pinned barrel keeps overall length down without the paperwork of a short-barreled configuration, and most report the M-LOK rail gives them enough space to run a light and foregrip without crowding.

Ergonomics split the crowd a bit. The pistol format works well with a brace or for range use, but a few owners find the .308 recoil in a lighter AR-10 frame more demanding to manage than a full-length rifle version. The optics-ready cut is consistently praised for flexibility.

Value perception is mixed. The Sentinel sits at the premium end for an AR-10 pistol build, and some buyers feel the street price is high relative to comparable platforms. Others point to Faxon's barrel reputation and consider the price reasonable for what they get.