SG 550

 is upgrades data for technicians that appears in S.T.A.L.K.E.R.: Lost Alpha.

"Detailed information with all necessary schematics for the SG 550 rifle, allowing to increase the accuracy."

- PDA information

Overview

 * Upgrades data in general allow technicians to perform certain upgrades on weapons and armor.
 * The  upgrade data enables the Inertia moderator and the Stop drive upgrades for the SGI 5k, increasing the accuracy.
 * Upgrades data are unique, i.e. only one specimen each exists on the board.
 * Acquisition is only possible in v1.4007:
 * Will be given on looting a corpse in Agroprom Underground.
 * The corpse is located in a side room on the same level as the key to Strelok's Hideout and the Controller, branching off the anteroom of the hall with the four water tanks.