For the four-year MMP, it essentially involves long guns that don't involve organized crime. The five-year and seven-year MMPs relate specifically to prohibited or restricted firearms or if the offence was committed “for the benefit of, at the direction of, or in association with, a criminal organization”, so that could be long guns and organized crime.
Paragraph 244(2)(b) would encompass situations in which a long gun was used but it wasn't linked to organized crime.