Faxon Firearms ARAK-21 12.50" Upper 7.62x39mm, Black

The ARAK-21 is a gas piston-actuated upper receiver assembly designed to integrate effortlessly with standard AR-15 platforms. Installation is quick and tool-free, requiring only the takedown and pivot pins, allowing users to upgrade their rifle in under a minute without modifying the lower receiver. This advanced system brings exceptional versatility and performance enhancements while maintaining ease of use. Each ARAK-21 upper receiver includes one or two Barrel Assembly Units (BAU), depending on the selected package. The BAU consists of a precision-engineered barrel, gas block, muzzle brake, gas piston, gas adjuster, and barrel trunnion. The gas adjuster knob, the only removable component, offers four settings to fine-tune gas flow. Three settings optimize performance based on conditions, while one completely blocks gas flow for single-shot operation. Designed for durability and adaptability, the ARAK-21 features a charging block, standard charging handle, lower forearm with screws, three full-length aluminum Picatinny rails, three insulating shims, a bolt carrier assembly, a lower recoil lug with a spring guide rod, and a dual recoil spring system. The package also includes an owner's manual and two Allen wrenches for securing the lower forearm and front Picatinny rails. With its innovative design, the ARAK-21 uses specialized components that enhance reliability and functionality, with only the firing pin, extractor spring, and ejector spring remaining interchangeable with standard AR-15 parts. This cutting-edge upper receiver delivers a refined shooting experience, setting a new standard in modular firearm performance.

• The upper receiver is machined from aircraft-grade 6061-T6 aluminum billet in a 1-piece design and includes a full-length picatinny rail (MIL-STD-1913) on top, with (3) additional rails on the muzzle end
• Making it a full M4 style quad rail upper, the top picatinny rail is laser-engraved for precise optic placement, providing a robust and versatile platform
• The 12-1/2 inches BAU barrel in 7.62 x 39mm has a heavy profile for enhanced performance
• Baus can be interchanged in less than 3 min by removing (6) captive Allen screws on bottom rail using enclosed Allen wrench
• The long stroke variable setting gas piston system offers (3) gas flow options and one for no gas flow, allowing for single-shot operation, with a clean-out port for the gas block
• The ambidextrous charging handle is non-reciprocating, foldable, spring-returned and can be easily relocated from left to right side without tools
• Model 39 inches 8-lug bolt design with an involute profile, compatible with both right and left hand versions, the extractor is positioned at 3 o'clock for smooth operation
• The left hand version can use the same bolt by removing the cam pin, rotating it 180 degree and reinstalling the cam pin for seamless operation
• Self-contained firing pin retention system enclosed in a rectangular bolt carrier that no longer requires a cotter pin, offering a simpler and more reliable design
• The bolted-in hardened steel rail system provides a metal-on-metal wear surface for the bolt carrier, resulting in better wear characteristics and smoother operation
• The ARAK-21 system supports the addition of a folding stock, thanks to a unique recoil system that does not extend beyond the upper receiver, eliminating the noise and feel of a buffer tube cycling back and forth