The Faxon Sentry is a complete AR-15 lower receiver machined from forged 7075-T6 aluminum. It ships assembled with a B5 Systems adjustable stock and grip already installed, giving builders a ready lower for a new rifle build or for upgrading an existing one. A tensioning screw is fitted to reduce stock wobble, and the receiver is built to accept multiple AR-15 caliber configurations rather than being locked to a single chambering. 
 

Key Specifications 

• Brand: Faxon 
• Model: Sentry 
• Material: 7075-T6 Forged Aluminum 
• Platform: AR-15 
   

Detailed Features 

• Forged 7075-T6 aluminum receiver body for a durable base 
• B5 Systems adjustable stock included and installed 
• Tensioning screw fitted for a tighter, rattle-free stock fit 
• Grip included as part of the complete assembly, nothing extra to source 
• Compatible with multiple AR-15 caliber builds, useful for new builds or upgrades

Builders shopping for a complete lower like the Sentry usually care most about fit and finish on the receiver itself, and Faxon's forged aluminum parts generally get good marks there. The B5 stock that comes installed is a step up from the basic stocks bundled with cheaper complete lowers, and the tensioning screw is a detail hands-on builders notice and appreciate.

Because the Sentry ships as a complete lower with the trigger group and stock already installed, first-time builders like that it removes a chunk of the assembly work from a first build. More experienced builders sometimes still prefer buying stripped and picking every part themselves, so opinions split along experience level.

On value, a complete forged lower from an established maker like Faxon is usually priced above a generic stripped lower, but owners tend to see the savings in assembly time and the included furniture as worth the premium for anyone not set on hand-picking every component.