I started out using the Bio Specialist and I couldn’t seem to equip a heavy weapon, even though i had set one in the equipment menu. I thought this class just didn’t support heavy weapons. All 3 classes can use heavy weapons. In order to equip a heavy weapon in Alienation, press and hold the weapon button.
On the Playstation this means you must press and hold . If you look at the weapons at the bottom right you will see that you now have the heavy weapon equipped. Time to start killing some aliens!
For more on the weapons in alienation, check out the weapons section of the guide.