Can you help? (Homefront: The Revolution)

In weapon machine in the about tab, the selection of weapons. assault rifle labeled as the Main 1. This suggests that there is Main 2 which I assume is placed in the lower slot marked with a cross. So the question is what kind of weapon is placed there? I bought a battle rifle there stuff is not given, the slot for the pistol I understand it is locked. And among the equipment there is no garment allows you to carry a third weapon. Tell me who was playing, how it all works?