I have noticed that the ammo finder perks on armor only work about 20% of the time, when they do work, I can get a ton of drops but when they don't (they usually don't) I can get maybe 3 or 4 heavy bricks (at the most) with 3 heavy ammo finders on during an entire activity.
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I think what they indeed need - is freaking CONSISTENCY. Because in PvE of all sorts (minus raids - haven't been there), even without Heavy Weight Strike Feat (or whatever - one that gives us more heavy ammo) there is enough heavy ammo to carefully play with machine gun drawn (i.e. firing mostly in semi-auto) having only one Heavy Ammo Finder perk armour. Yet in Gambit, having three or even four may spawn zero heavy ammo pouches. I played few matches today and only one of them showered me with 2 pouches. Since I don't touch those spawn points, how the hell I'm supposed to fight primeval if I'm titan and my super isn't as effective as other classes? Can't say much for special ammo, I rarely use weapon that uses it. But clearly, given lower reserves it's impossible to play with one sniper rifle (19 rounds) playing with one Special Ammo Finder.