I have a black 180mm for my KO Rapid M. It does have a two-stage lens hood. None of the lens elements move in or out on mine. Maybe there's a filter of some sort stuck in the inner part of the lens hood that you're mistaking for a front group? It's a long shot guess as the inner part of the hood isn't threaded for a filter. Here's a photo of my KO with the lens hood extended: