Turns out, we are getting not one, but two heavy weapons to help us in our march against the bots: the LAS-99 Quasar Cannon and the MG-101 Heavy Machine Gun (HMG), which are both available in-game ...
A machine gun designed for stationary use ... Each Magazine is packing 150 rounds with 3 magazines at your disposal. You will have to strategize each reload as you can't reload while moving.