GUNS N' ROSES were forced to postpone their concert in Zurich, Switzerland last night (21JUN06) after drummer BRYAN 'BRAIN' MANTIA flew back to the US to support his heavily pregnant wife. Replacement drummer FRANK FERRER will be stepping in on Saturday (24JUN06) for the Graspop festival in Belgium. Mantia is expected to return to the band in around two weeks time. The Zurich concert has been postponed till 1 July (06), the tickets will stay valid.