Faxon ARAK-21 Complete Upper 5.56 NATO 12.5″ Black

Description

The Faxon Firearms ARAK-21 is a piston-actuated, complete upper receiver assembly built to interface with a standard AR-15 lower using the takedown and pivot pins. It ships as a complete Barrel Assembly Unit (BAU) that includes the barrel, gas block, piston, gas adjuster and muzzle device. The system features an adjustable gas regulator with four settings—three flow settings plus a gas-blocking single-shot setting—and installs without tools in under a minute. The ARAK-21 pairs a billet aluminum upper receiver and M4-style quad rail with ambidextrous controls for versatile, low-maintenance operation.

Key Specifications

• Caliber is .223 Rem / 5.56 NATO.
• Barrel length is 12.5 inches.
• Rate of twist is 1:8″.
• Barrel material is steel.
• Barrel finish is nitride.
• Operating system is piston actuated with an adjustable gas system.
• Upper receiver material is billet aluminum.
• Rail system is a M4-style full-length quad rail.
• Includes ambidextrous safety and charging handle.
• Item weight is 5.1 lbs.

The ARAK-21 complete upper brings a robust piston-driven design and an adjustable gas system to a compact, 12.5″ package. Its billet receiver and full-length quad rail provide a stable foundation for optics and accessories while the included BAU simplifies installation and maintenance. For users seeking a compact, low-maintenance upper that preserves AR-15 lower compatibility, the ARAK-21 offers a practical balance of durability, modularity and user-adjustable gas control.