Faxon Firearms Arak-21 Xrs Billet Rifle - Black 7.62X39 16" Barrel Ambidextrous Ejection ARAK-21XRS762 816341021990

Introducing the ARAK-21, a revolutionary gas piston-operated complete upper receiver assembly engineered to seamlessly integrate with the standard AR-15 platform. Compatible with your existing lower receiver using just the takedown and pivot pins, the ARAK-21 installs in under a minute without any tools required. Each ARAK-21 upper receiver comes equipped with a "Barrel Assembly Unit" (BAU) comprising the barrel, gas block, muzzle brake, gas piston, gas adjuster and barrel trunnion. The gas adjuster knob offers four settings: three for optimizing gas flow and one for single-shot operation. The upper receiver includes a charging block, standard charging handle, lower forearm with screws, three full-length aluminum picatinny rails, insulating shims, bolt carrier assembly, lower recoil lug with spring guide rod and a dual recoil spring system. With your ARAK-21 upper receiver, you'll also receive an owner's manual and two Allen wrenches for attaching the lower forearm and front picatinny rails, ensuring a comprehensive and user-friendly setup for enhanced versatility and performance.