Faxon ARAK-21 Upper | 5.56 NATO | 16″ | URSSB556

The Faxon Firearms ARAK-21 complete upper is a fully assembled AR-15 upper built around a 16-inch nitride steel barrel and a piston-actuated operating system. It pairs a billet aluminum upper receiver with an adjustable gas system, M4-style quad rail and Muzzlok muzzle device. This configuration is intended for users seeking a tunable, low-maintenance gas system for range work and competitive or practical shooting.

Product Specifications

• The manufacturer is Faxon Firearms.
• The model is ARAK-21.
• The manufacturer’s part number is URSSB556.
• The UPC is 816341021952.
• The caliber is 223 REM/5.56 NATO.
• The barrel measures 16 inches.
• The rate of twist is 1:8″.
• The barrel material is steel.
• The barrel finish is nitride.
• The upper receiver material is billet aluminum.
• The gas system is adjustable and the action is piston actuated.
• The handguard is an M4-style quad rail with a steel rail system for the bolt carrier.
• The muzzle device is a Muzzlok muzzle device.
• The unit weight is 5.5 lbs.
• The finish and color are black anodized and black.

This complete upper offers a practical, feature-rich package for shooters who prioritize a piston operating system, adjustable gas tuning and a hard-chromed, nitride-treated barrel for extended use on the range or in competition. Its billet receiver and full quad rail provide a stable mounting platform for optics and accessories while maintaining the dimensions expected for AR-15 uppers.