The Faxon Firearms Sentry Semi-Automatic Rifle, AR-15, 5.56 NATO, 16" Barrel, Faxon MUZZLOK Muzzle Device, Mid-Length Gas System, Anodized Finish, 15" Free-Float M-LOK Handguard, Hiperfire EDTM Single-Stage Trigger, 30+1 Rounds, FX5216 (UPC 816341025370) is a premium, out-of-the-box upgraded modern sporting rifle built for training, home defense, and hard-use range work. Part of Faxon’s Summit Line, the Sentry delivers top-tier components and thoughtful ergonomics at a price point that stays within reach of serious shooters.
Summit Line AR-15 – Built to Run Hard, Right Out of the Box
Faxon has long been respected for their high-quality barrels and AR parts. With the Sentry 16" 5.56 rifle, they roll that expertise into a complete rifle featuring:
Enhanced forged receiver set with tensioning screw for a tight upper/lower fit and improved accuracy potential
Nitrided M16 BCG with superfinish, designed for smooth cycling and easy cleaning
Faxon Lifetime Guarantee / robust warranty support, depending on retailer, so you can run the gun with confidence
The Sentry is designed as a duty-ready, defensive, and training rifle with upgrades most shooters typically add later—already installed from the factory.
16" 5.56 NATO Gunner Profile Barrel & Mid-Length Gas
At the heart of the Sentry is Faxon’s renowned 16" 5.56 Gunner Profile barrel, optimized for balance and performance:
Caliber: 5.56 NATO / .223 Remington compatible
Barrel Length: 16"
Profile: Faxon Gunner Profile – blends the durability of a government-profile barrel with the lightweight feel of a pencil barrel
Finish: Nitride coated for corrosion resistance and extended barrel life
Gas System: Mid-length gas for smoother recoil impulse and less wear on parts vs. carbine-length systems
The Gunner barrel’s weight savings shift the balance point back toward the shooter, improving handling, speeding transitions, and reducing fatigue during long sessions.
Faxon MUZZLOK Muzzle Device – Tunable & Suppressor-Friendly
Up front, Faxon equips the Sentry with a Faxon MUZZLOK® muzzle device, a versatile system that offers:
Tool-less timing using a unique tension nut design, no shims or crush washers required
Secure lock-up with the ability to remove and reinstall without losing alignment
Excellent muzzle control and recoil mitigation for faster follow-up shots
For shooters who may later integrate suppressors or specific brakes/compensators, the MUZZLOK system is a big plus.
15" Free-Float M-LOK Handguard – Maximize Control & Mounting Space
The Sentry comes with a lightweight 15" free-float M-LOK aluminum handguard that runs nearly the full length of the barrel:
Free-float design isolates the barrel from sling, grip, and accessory pressure for better accuracy
M-LOK slots at multiple positions for mounting lights, grips, bipods, QD sling sockets, and more
Long 15" length gives you extended support-hand placement, ideal for modern thumb-over-bore and C-clamp grips
This combination produces a rifle that’s stable, controllable, and highly configurable for any mission, match, or training environment.
Hiperfire EDTM Single-Stage Trigger – Clean, Duty-Ready Break
A standout upgrade from the factory is the Hiperfire EDTM (Enhanced Duty Trigger – MILSPEC) single-stage trigger:
Crisp, clean single-stage pull that’s significantly better than a standard mil-spec trigger
Designed as an Enhanced Duty Trigger, balancing reliability with improved feel
Ideal for defensive use, patrol rifles, and serious training guns
Paired with Faxon’s tight receiver fit and barrel, this trigger helps you get the most out of the rifle’s inherent accuracy.
Fully Ambidextrous Controls – Ready for Any Shooter
The Faxon Sentry doesn’t stop at just a good barrel and trigger—it ships with ambidextrous controls:
Radian Raptor LT ambidextrous charging handle for easy manipulation from either side
Radian Talon ambi 45/90-degree safety selector, allowing you to choose short-throw or standard as you prefer
These features make the Sentry left-hand friendly and ideal for shooters who train ambi manipulations for self-defense or competition.
Quality Furniture – Magpul MOE SL Stock & Grip (or Similar)
To round out the package, Faxon equips the Sentry with upgraded furniture:
Magpul MOE SL® carbine stock (or similar upgraded stock) for a slim, snag-free profile and solid cheek weld
Magpul MOE® pistol grip (or similar) with improved ergonomics over standard A2 grips
Retailers note that, depending on availability, Faxon may use equivalent quality furniture, but always in line with the Summmit Line’s upgraded focus.
Lightweight, Well-Balanced & Ready for Defense
Even with its robust feature set, the Faxon Sentry stays impressively light:
Weight: approx. 6.1 lbs (unloaded)
Capacity: 30+1 rounds, includes one 30-round magazine (magazine may be removed or substituted in restricted states)
That light weight, paired with the Gunner barrel and mid-length gas, makes the Sentry very easy to run in:
Home defense & duty roles
Carbine classes and training courses
3-Gun and practical rifle competition
Key Specs – Faxon Firearms Sentry AR-15 Rifle FX5216
Manufacturer: Faxon Firearms
Model: Sentry 16" Summit Line Rifle
Part Number / SKU: FX5216
UPC: 816341025370
Action: Semi-automatic AR-15
Caliber: 5.56 NATO / .223 Rem
Barrel: 16" 5.56 Gunner Profile, nitride coated
Gas System: Mid-length
Muzzle Device: Faxon MUZZLOK® muzzle device
Handguard: 15" free-float M-LOK aluminum handguard
Trigger: Hiperfire EDTM single-stage trigger (Enhanced Duty Trigger variant)
Receivers: Enhanced forged upper & lower with tensioning screw
BCG: Nitrided M16 BCG with superfinish
Controls:
Furniture: Magpul MOE SL® stock & Magpul MOE® grip or similar upgraded components
Capacity: 30+1 rounds, includes 1 magazine
Weight: ~6.1 lbs (unloaded)
Finish: Black anodized
If you’re looking for a feature-rich, semi-automatic AR-15 in 5.56 NATO that comes from the factory with a match-worthy barrel, enhanced trigger, ambi controls, and premium furniture, the Faxon Firearms Sentry FX5216 is a standout choice—balanced, accurate, and ready for defense or training the moment it leaves the box.
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