Yes. The criteria are in section 84 of the Criminal Code. There are a variety of criteria that affect the classification of firearms in several different ways.
Each portion of section 84 deals with firearms for certain purposes in its own way. There's no standard way of dealing with this. In some cases a firearm could be prohibited because the barrel, for example, is cut down. In other cases the firearm could be prohibited because it fires in a fully automatic manner.
In the case of the schedule we're speaking about today, a firearm could become prohibited because it is a varied or modified version of a firearm that's named in the regulations. A firearm could also become prohibited if it's chambered for a calibre that produces an energy over 10,000 joules of muzzle energy. A firearm could become prohibited if it has a bore diameter of over 20 millimetres, and so on. There are many different criteria that apply in different ways.
The process would be to look at the characteristics of the firearm and determine whether or not they interact with any of these criteria that are sprinkled through the Criminal Code and the associated regulations.