UMP-45

The UMP-45 in Counter-Strike 1.6 was a Terrorist-only weapon. Its real-world counterpart, the Heckler & Koch UMP45, was developed in the 1990s (first introduced in 1999), not the 1980s. The UMP-45's magazine capacity in Counter-Strike 1.6 was 25 rounds, not 32. The UMP-45 did not appear in every major Counter-Strike title from 1.6 through CS2; it was absent from Counter-Strike: Condition Zero (though it appeared in Condition Zero: Deleted Scenes, the main game used a different weapon set).