The M4A1 Carbine is used by several characters in the film including both Ecks and Sever as well as Robert Gant (Gregg Henry). Ballistic: Ecks vs. Sever is one of the first movies to feature M4s with the newer 6-position ("LE") collapsible stock.
While helping Ecks escape the prison transport bus, Sever carries a AKS-74U with black furniture and fitted with a GP-25 grenade launcher which she uses to destroy the bus and topple several piles of vehicles in the scrap yard. She also uses a standard AKS-74U without the GP-25 during the train yard shootout (due to a continuity error, it often switches back and forth with an MP5A2).
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