When giving survivors weapons, try to give them blades such as katanas or cleavers. The mini-chainsaws Adam uses are also good, but remember to switch them for something else before going into the security room. Also, if you prefer guns, shotguns and a submachine gun are good except for the stray bullets that hit you. If you give them a gun, try to give survivors shotguns. They will kill the zombies around them and you. They help each other out and very little damage is done if they hit you or each other.