Big F, who's just gotten out of prison, wastes no time in tracking down his old comrades, picking up bowling alley employee Crazy B, back-alley hairstylist Johnny T and mechanic East L in quick succession. As it turns out, Big F wants to rob a truck transporting dirty money across the Mainland-Hong Kong border, and to do that, the gang's got to pose as police officers. On the day of the heist, the men set off in their minibus-turned-police-vehicle dressed as cops and armed with BB guns. What they don't know is that another group of criminals also has its sights set on the truck and those people have AK-47s.