I don't think fighters armed with 2 .303 (7.7mm) are going to worry crews flying a rugged machine like the Vengeance too much, for one thing it out guns the Nate and Claud by 3 to 1.The Vengeance had one severe flying problem in having no visibility straight ahead, due to the wing incidence being set for vertical dives, and it had serviceability problems with both the airframe and the crap Wright R-2600 engines, built during the time when Wright had problems. British mechanics learned to deal with the problems in time, but the French couldn't be bothered. Although it might be faster than the A5M, it was slower than the Ki-27.