It depends on the model of router you have. Most of the major brands have a model that can switch between a fixed and plunge base. If you router motor is not easily removed from the fixed base, then there likely is not a plunge base for it.
That sounds like the ryobi I got with the router/table combo.
I never got around to checking ryobi's web site to see if there was a plunge base available for it before I was surprised with a plunge router. Still not a 1/2" one, so I will need another router in the future.
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