Faxon Firearms Arak-21 Xrs Billet Rifle - Black 5.56Nato 16" Barrel Ambidextrous Ejection ARAK-21XRS556 816341021983

Introducing the ARAK-21: a revolutionary gas piston actuated complete upper receiver assembly designed to seamlessly integrate with the standard AR-15 platform. It interfaces with your current lower receiver using only the takedown and pivot pins, requiring no modifications and installs in under a minute without tools. Each ARAK-21 upper receiver includes 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 optimal gas flow and one for single-shot operation. The upper receiver also features 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. Your ARAK-21 comes complete with an owner's manual and two Allen wrenches for attaching the lower forearm and front picatinny rails, ensuring quick setup and customization for your AR-15 platform.