When you buy an upgrade for something, does that make it automatically work? Or do you have to equip it to your weapon/armor somehow? Man, I'm playing on Casual and I find the game surprisingly difficult! I just finished the "Archangel" mission and I almost died many times. I'm learning to use my squadmate's shield-strip powers as much as possible, though, so that helps. I'm a Soldier. Oh yeah and having ammo is really annoying, I miss the old system. I keep running out of ammo on my assault rifle in the middle of a fight.