Faxon ARAK-21 Complete Upper – 5.56 NATO, 16″ Barrel, Monolithic Billet Upper, Ambidextrous Ejection, Bolt Carrier Assembly Included

Revolutionize your rifle build with the Faxon ARAK-21 — a complete upper that merges the best of AR and AK platforms into one elite, monolithic design. Built for strength, modularity, and ambidextrous performance, the ARAK-21 features a monolithic upper receiver, integrated bolt carrier group, and a user-configurable ejection system.

With a 16″ 5.56 NATO barrel, ambi charging handle, and quick-change barrel system, this upper is designed for hard use, suppressor setups, and high-performance AR enthusiasts.

Faxon ARAK-21 Complete Upper Receiver 5.56x45mm, 16″ Barrel, Black, Ambidextrous Ejection, Bolt Carrier Assembly

The ARAK-21 is a gas piston actuated, complete upper receiver assembly designed to seamlessly interface with the standard AR-15 platform. The total extent of the interface is simply the take down pin, and the pivot pin. The new ARAK-21 upper receiver offers you all its features with no change to your current lower receiver and can be installed in less than one minute with no tools. The BAU is comprised of the barrel, gas block, muzzle brake, gas piston, gas adjuster, and barrel trunnion. The only removable part of this assembly is the gas adjuster knob. The gas adjuster knob has 4 settings. Three of the settings allow different gas flows for optimum operation, and one setting blocks the gas flow for a single shot operation.

The upper receiver includes the charging block, standard charging handle, lower forearm with screws, three aluminum full length picatinny rails, three insulating shims, bolt carrier assembly, lower recoil lug with spring guide rod, and dual recoil spring system. Due to the unique and innovative features of the ARAK-21 upper receiver, there are very few parts that are interchangeable with a standard AR-15. The firing pin, extractor spring, and ejector spring are the only parts that are standard and interchangeable with an AR-15 upper receiver…..

⚙️ Key Features:

• Caliber: 5.56x45mm NATO

• Barrel Length: 16” – Threaded, free-floating, high-performance Faxon barrel

• Gas System: Long-Stroke Piston Driven – Runs cooler, cleaner, and more reliably

• Construction: Monolithic 7075-T6 Billet Aluminum Upper – Extreme rigidity and alignment

• Ejection System: Ambidextrous – User-configurable for left or right side ejection

• Bolt Carrier Group: Proprietary BCG included – Fully integrated

• Charging Handle: Non-reciprocating, forward-positioned, ambidextrous

• Muzzle Thread: 1/2×28 – Suppressor and muzzle device ready

• Finish: Black Anodized

• Compatibility: Works with any mil-spec AR-15 lower receiver

• Made in the USA

Whether you’re building a suppressor-ready precision rifle, a duty-grade AR, or just want something way beyond the standard, the ARAK-21 is in a class of its own.

FAQ:

Q: What lowers are compatible with the ARAK-21?
A: The ARAK-21 is designed to work with mil-spec AR-15 lowers, giving you a completely modular yet high-performance platform.

Q: Is this a direct impingement or piston upper?
A: The ARAK-21 uses a long-stroke gas piston system, which runs cleaner and cooler than traditional DI systems.

Q: Can I switch the ejection side myself?
A: Yes — this upper features user-configurable ejection, allowing you to change from left-hand to right-hand ejection without tools.

Q: Does this include a bolt carrier group and charging handle?
A: Yes — the proprietary bolt carrier and ambidextrous charging handle are fully integrated and included.

Also Available:

Radian Model 1 Complete AR-15 Upper – 10.5″ .223 Wylde Threaded Barrel, Black Cerakote, M-LOK, Includes BCG & Raptor Charging Handle

Del-Ton Complete AR-15 Upper Receiver – .223/5.56 NATO, 16″ Heavy Barrel, Flat Top, A2 Flash Hider, Mil-Spec Forged Upper

Angstadt Arms UDP-9 Complete Upper – 9mm, 6 Barrel, Threaded, Includes 9mm BCG & Charging Handle, Black Finish