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The M4A1 Carbine was used by at least one mercenary working for the L.A. Dollhouse during an engagment of Echo's. The weapon was prepped for use inside a helicopter on the way to a house where Davina Crestejo was determined to be located. It was then used by a mercenary when entering the house behind Sierra (who herself was on an engagement) to clear the building and act as back up. (S1: "Ghost")