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Better balancing of the mechanism's working parts allows the weapon's rate of fire to be significantly increased.Ingame item description.
The Flash drive with data on balancing automated parts is a mission item in S.T.A.L.K.E.R.: Clear Sky.
The flash drive contains upgrade data for an AKM-74/2U and can be delivered to Van in the Loner base in Cordon for a reward of 1355 RU, after which he will be able to apply the upgrade to the player's weapons.
The flash drive can be obtained from the corpse of General - a soldier located at the vehicle depot in Cordon. Typically, a player would encounter him while doing the "Eliminate the military at the depot" task for Father Valerian.