Which of the following firearms is a resident of Massachusetts prohibited from possessing without a proper license?

Residents of Massachusetts are required to have a proper license in order to possess any large capacity firearm. This means that options A and B, which pertain to non-large capacity firearms, are incorrect. Option D is also incorrect as it includes options A and B, which we have already determined to be incorrect. Therefore, the only remaining option is C, large capacity firearms, which is the correct answer.