The Faxon ARAK-21 XRS features a Magpul SL Stock; Magpul MOE Grip; ambidextrous safety/selector; ambidextrous charging handle; self-contained firing pin retention system; full length picatinny rail on the top and three additional rails on the muzzle end of the receiver, making it a full M4 style quad rail upper. Includes magazine and BAU removal tools.