There are no Model components in the Struts framework. One of the biggest misconceptions is that business logic should be coded in Action classes and that ActionForms are model data.
Struts is a framework for building the View and the Controller parts only.
All of the Struts classes that start with 'Action' are part of the Controller and the developer writes Action classes to customize the behavior of the Controller.
Struts is called a MVC framework because it "helps" with creating a MVC-based application. However, it does not provide anything for the Model part.
That said, when developers attempt to write a Model in the Struts (it can be done), there typically are failures and unwanted dependencies as well as a bunch of other crap