|Flash drive with data on submachine gun barrel modification|
|“|| An attachment which lengthens the barrel, increasing muzzle velocity.|
- Ingame item description.
The Flash drive with data on submachine gun barrel modification is a mission item in S.T.A.L.K.E.R.: Clear Sky.
The flash drive contains upgrade data for a Viper 5 and can be delivered to Gray in the Clear Sky base at the Great Swamps for a reward of 1125 RU, after which he will be able to apply the upgrade to the player's weapons.