I want to elaborate on what Solid.nl posted and this thread seems to be the best place for this suggestion. Problem: Cost/benefit is too great to fire your weapon (non-silent). Again, once alerted, the danger escalates exponentially. Firing your weapon attracts WAY too many zombies. Suggestion: reduce sound proximity, reduce zombie count, implement melee (Arma3 supposedly), increase silent weapons (less realistic but still an option). I do think this issue needs to be examined more closely. I also think its a real problem in this patch.