Kill cashier with Mini Gun. Just shoot him. Don't bother about hiding from him. Once you've wasted all the ammo of your mini gun he should be dead and you get... Mini Gun Ammo!
teh awesomest was to put fake walls aroud the map but block up every entrance but one then cover the whole map but leave a line blocking the other side and keep shooting the rocket and nothing can hurt you and you just need to make ammo
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