Unlike other CS2 knives, the M9 Bayonet has no curves: both the blade and the handle are uncompromisingly straight. This design is based on the main purpose of this knife—to be attached to old-style assault rifles and used as a weapon in close-range battles. Beyond that, the M9 Bayonet has many practical usages, thanks to its really big blade and sawback. The impressive size makes the knife one of the most popular in the game. The M9 Bayonet was added to Counter-Strike with the Arms Deal update.