OK so a gun can intensive fire but a an AFV gun cannot in the AFPh . Mmmmm - that's a catch!You wrote "+1 for BU" so it must be the tank firing in the AFPh. First, a vehicle loses its acquisition when it leaves its present Location (C6.5, unless gyrostabilized). Second, like any vehicle which moved to a new hex, Case C applies. Third, you mentioned "IF"; C5.6 says Intensive Fire cannot be used during the AFPh. Fourth, Target Based DRMs apply as normal, and finally, there might be more Firer Based DRMs (e.g., Armor Leader).
Only if the Gun was marked "Opportunity Fire" during the PFPh.OK so a gun can intensive fire but a an AFV gun cannot in the AFPh . Mmmmm - that's a catch!