Faxon ARAK-21 7.62x39 Complete Upper Receiver

The ARAK-21 Upper Receiver: Modern Engineering Meets AR-15 Compatibility

The Faxon ARAK-21 represents a thoughtful evolution in upper receiver design. This complete upper assembly uses a proven gas piston system rather than direct impingement, offering shooters a cleaner, cooler operating platform without sacrificing the familiar AR-15 interface.

Installation and Compatibility

The beauty of the ARAK-21 lies in its simplicity. Installation requires only two pins—the takedown pin and pivot pin—and takes less than a minute with no tools required. Your existing AR-15 lower receiver works without modification, making this an ideal upgrade path for shooters looking to explore the 7.62x39mm cartridge.

What's Included

Your ARAK-21 ships with a complete Barrel Assembly Unit (BAU) featuring:

• 12.5" barrel optimized for the 7.62x39mm cartridge
• Integrated gas block and piston system
• Muzzle brake for recoil management
• Four-position gas adjuster (three operational settings plus single-shot mode)
• Charging handle and bolt carrier assembly
• Three full-length Picatinny rails for optics and accessories
• Dual recoil spring system for reliability
• Insulating shims and all necessary hardware

Performance and Adjustability

The four-position gas adjuster allows you to tune the system for different ammunition types and shooting conditions. Three settings optimize gas flow for reliable cycling, while the fourth position blocks gas flow entirely for single-shot precision work. This flexibility makes the ARAK-21 equally at home at the range or in the field.

Build Quality

Faxon's engineering is evident in every detail. The lower forearm, rail system, and receiver are designed to work as an integrated unit. While most components are proprietary to the ARAK-21 platform, the firing pin, extractor spring, and ejector spring remain standard AR-15 parts, simplifying maintenance.

Includes owner's manual and two Allen wrenches for field adjustments.