This 5.56 NATO HM15 features a nickel boron full billet upper and lower, nickel boron picatinny rail, 16" CrMO spiral fluted barrel, ,CNC machined V1-556 black flash hider, magpul STR black stock, MOE magpul black grip, PMAG magpul magazine, ambi safety, QD end plate, and extended charging handle.