Repeater can be swapped for Hair Trigger, giving you a chance of an additional action.
Recommended upgrades for specific classesĮach of the classes can use any upgrade on their weapon, but some of them are more useful than others, such as: The second choice is to use the Black Market, but similarly to PCS, it's quite an expensive source of weapon upgrades, as it requires you to spent a lot of Intel points, which are better spent elsewhere during the first weeks of the game. Obviously, the rarer and more powerful an upgrade is, the less are the chances of picking up one, which is why you should think twice before installing a Superior-rank upgrade.
The main source of weapon upgrades are fallen enemies - one, sometimes twice during a single mission an enemy will drop an item which can be picked up, and most often of one of those dropped items there will be a weapon upgrade piece. 15% chance that the shot won't cost an action point