3 Gun is still run the same way it always has been, with only one gun per stage. The new rule set is Multi Gun which is the American 3 gun nation rules adapted for NZ. All the info is on the PNZ 3gun/multigun page, 3 gun
As far as I have followed it, firearms are dumped in barrels or on tables with either safety applied or fully unloaded, and if not left in the correct condition it's a DQ. Although that said I haven't had a proper read of the new rules since they were updated recently.
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