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
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