canon on mossie like on b25 mossie had one for ships
Other fighter-bomber variants were the Mosquito FB Mk XVIII (sometimes known as the Tsetse) of which 27 were made by converting Mk VIs. These were fitted with a Molins 57 mm cannon, a 6 pounder anti-tank gun modified with an auto-loader to allow both semi- or fully-automatic fire, in the nose, along with two .303 in (7.7 mm) sighting machine guns. The Air Ministry initially suspected that this variant would not work, but mock tests proved otherwise. Although the gun provided the Mosquito with yet more anti-shipping firepower to pit against U-boats, it required a steady and vulnerable approach-run to aim and fire the gun, thus making rockets more effective, especially because Mosquitos without the 6 pounder didn't suffer the weight penalty of the gun. The FB Mk 26 and FB Mk 40, based on the Mk VI, were built in Canada and Australia and were powered by Packard-built Merlin engines