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GK-02 12ga muzzle brake (Comb. muzzle device) in Escape from Tarkov. Flea market: 24,999 ₽. Traders: 4,046 ₽. The Ilyin GK-02 muzzle brake is a modernized and improved version of Vsevolod Ilyin's muzzle brake, with enhanced recoil and muzzle climb reduction capabilities.