Grey is a member of Clear Sky. He serves as their mechanic and is described by his comrades as an expert in his field. The player can visit Grey in the Clear Sky base for equipment repairs and upgrades. He also hands out a quest to find and bring back USB drives with upgrade data. Grey is the only one who can fully upgrade the AN-94 and AK-74. He returns in Call of Pripyat, where he works as a mechanic for the scientists. It is possible that Owl saved his life, as when you complete Owl's task about the detectors he says he owed him a favor.
Grey
Trivia
The name "Grey" was one of three names confusingly used to refer to the Shadow of Chernobyl character Seriy before an early patch corrected it.