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It's not a glitch. It's part of the hacker can do

With hacker you can give other players 500 of your points at a time, open doors for like 200 points, and my favorite: for 3000 you can switch the cost of ammo on wall guns from 500-normal/4500-upgraded to 4500-normal/500-upgraded.

oh that's what happens when you hack a gun. cool