You're supposed to switch weapons when you die or in between rounds. If you change weapons while alive in PvP, then you'll lose all your special/heavy ammo.
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Ah. For a while it was only half, I thought that was still the case. Yeah they really should change that exploit ASAP because that's dumb...
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That's only in PvP though. If you're doing PvE and you switch special weapons, you'll lose half your special ammo. But yeah that icebreaker exploit is annoying. I came across teams using it to get ammo in trials yesterday.