Bushmaster's QRC (Quick Response Carbine) features an A4 flat top receiver constructed of 7075-T6 forged aluminum. It also has a barrel with A2 birdcage-type flash hider, BFSIII three position trigger, and C.A.R style handguard. - CALIBER 223 REM/5.56MM NATO - MAGAZINE (1) 30rd capacity - BARREL 16", A2 Flash Hider - RECEIVERS 7075-T6 Aluminum - HANDGUARD C.A.R style - TRIGGER BFSIII three position - STOCK 6 Position Collapsible