Sounds like you do waves 1 thru 7 everytime? Did you know you can just do wave 6 and 7 over and over? Guns only drop from wave 7, so doing waves 1 thru 5 is a waste of time. If you dont want the armor, dont open the chest. You dont need the chest to get a gun.
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Yeah I know, that is how I got the two shot guns the first time (back ages back). Its seems harder now to get people to stay around to try again from level 6 as I think they get p!$$ed off at getting nothing and leave.
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You can probably 3 man it? Maybe find some LFG people to grind out for an hour+?