WHY WHEN I USE A HEAVY AMMO PACK, IT MAKES ME WAIT 5 MINUTES FOR THE COOL DOWN BUT REFUSES TO GIVE ME MY HEAVY AMMO !? WTF !
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If you have every slot filled take out 1 or 2 things in your inventory. For some reason there is a glitch if it is completely full you won't receive heavy ammo.
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You need to have one or two empty slots for it to work.