So... don't switch.
It's stuid I know, but I pick what I want when you're flying to map, and when I'm out of ammo, I switch.
And then to get scientific with it, I doubt a FIM-92 Stinger could shoot an AT-4 rocket, you know what I'm saying?
English
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I know for a fact a rocket will not get launched by an anti aircraft missile system.
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Exactly
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Mate, in this game there is only primary,special and heavy ammo. Universal for each slot. Thats why if you have 0 heavy ammo with a launcher equipped and pick heavy off the ground, you will have ammo for your machine gun too when you switch to one. It does not make sense to LOSE "just cause" ammo when switching to the same weapon type.