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He 177 A-1/U2 Zerstorer

(copied from wikipedia)
In addition to carrying a variety of bombs, torpedoes, and guided weapons, the He 177 was tested with a number of unorthodox offensive armaments. The first of the experimental weapons fitments known to have been tested was the 12 examples of the He 177 A-1/U2 Zerstörer variant, which was armed with a 30 mm MK 101 cannon in the extreme front of a dramatically enlarged Bola ventral gondola (beyond the hemispherical "fishbowl" nose glazing), and intended for ground attack, train busting, and possibly long-range anti-ship raids. These aircraft were also intended to be used against Allied long-range reconnaissance and bomber aircraft operating over the Atlantic Ocean, which were posing a danger to the Kriegsmarine's U-boat fleet.

original plane: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2127429131&searchtext=he+177
(inf ammo needed)