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Called "UC .50 Pistol" in the game, the GSh-18

 can be unlocked after finding Grigori in Moscow. It fires .50 caliber rounds in Alpha Protocol, however it is only available in 9mm in real life. The upgraded version with light brown frame is called "UC Cossak". The more improved variant is the "UC Commissar". The starting ammo capacity is 12 rounds (13 for the "Commissar") and it can be boosted to 18, resp. 19.
Ap gsh-18