Faxon ARAK-21 Complete Upper 5.56 NATO 12.5"
Gas piston upper receiver assembly for AR-15 platforms. Features adjustable gas system, tool-free installation, and includes barrel assembly unit with muzzle brake.
Fits: AR-15
The ARAK-21 Advantage
The Faxon ARAK-21 represents a significant departure from conventional AR-15 upper receiver design. This gas piston-actuated complete upper assembly brings modern operating principles to the AR platform while maintaining compatibility with your existing lower receiver.
Installation and Compatibility
One of the ARAK-21's most compelling features is its simplicity. Installation requires nothing more than the takedown pin and pivot pin—no tools needed, and the job takes less than one minute. Your current AR-15 lower receiver works without modification, making this an ideal upgrade path for shooters looking to enhance their existing rifles.
The Barrel Assembly Unit
The heart of the ARAK-21 is its integrated Barrel Assembly Unit (BAU), which combines:
- Precision barrel with integral trunnion
- Gas block and piston system for reliable operation
- Muzzle brake for recoil management
- Adjustable gas knob with four settings
The gas adjuster offers three operational settings for optimized performance across different ammunition types and conditions, plus a fourth setting that blocks gas flow entirely for single-shot operation when needed.
Complete Upper Assembly Features
Beyond the BAU, your ARAK-21 includes:
- Charging block and standard charging handle
- Lower forearm with attachment screws
- Three full-length aluminum Picatinny rails for accessory mounting
- Three insulating shims for thermal management
- Bolt carrier assembly
- Dual recoil spring system with lower recoil lug and spring guide rod
What's in the Box
Each ARAK-21 ships with owner's manual, two Allen wrenches for forearm and rail attachment, and your choice of one or two barrel assembly units depending on your package selection.
Important Considerations
The ARAK-21's innovative design means limited parts interchangeability with standard AR-15 uppers. Only the firing pin, extractor spring, and ejector spring are cross-compatible. This is a purpose-built system designed to deliver superior performance through its unique engineering.
