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Mi24 addmagazine "MachineGun30"
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This changed with the release of Resistance...
I learned the hard way when one of my cutscenes stopped working... ;D
Try:
Mi24 addmagazine "MachineGun30E"
In future if you want to get a list of the weapons/magazines carried by any unit (or vehicle), try using a trigger like this:
TriggerRadius: 0,0
Condition: Radio Alpha
Condition Field: this
OnActivation Field: hint format ["%1\n\n%2",weapons
unit, magazines
unit ]
Which will give you a list of the weapons
unit has, then a list of the magazines it has