1 - Counter-Strike: Condition Zero Addon - OP4 m40a1 w/o Silencer Counter-Strike: Condition Zero Addon - OP4 m40a1 w/o Silencer - This is the new OP4 m40a1 w/o Silencer skin for the game Counter-Strike: Condition Zero. License: Demo OS: Windows Size: 2.2 MB KB