Hordes n' holdouts are still a thing. You're also assuming that the player has a 100% full magazine at the start of a boss encounter, which is not always the case. Extra mag size gives a lot more wiggle room in that regard. ... The days of giving the Armsalt the HMG are "past". You're joking, right? The HMG is literally designed to be used by the Arms Assault. Someone with HCM being second choice I can see, but there is no situation that I can think of where he wouldn't get first dibs. I am aware of this - I was the one who made that change. Concentrated Fire gives you +15% Critical Strike while active if Critical Strike has a point in it, meaning that if you have one point in Critical Strike you're getting 50% of a Level 3 Critical Strike while Concentrated Fire is active. Putting additional points into Critical Strike doesn't really net you anything other than the 10% per level.