Four 20 mm cannon were mounted in the nose, making it the most heavily armed fighter aircraft of its era; the clustering of the weapons also meant that there were no convergence problems as with wing-mounted guns.
Four 20 mm cannon were mounted in the nose; the 600 lb/minute fire rate made it the most heavily armed fighter aircraft of its era. Moyes p3 The clustering of the weapons also meant that there were no convergence problems as with wing-mounted guns.