Potez 631 is a triplace heavy fighter - not a bomber nor an assault plane
from the Potez 631 - 1940 technical notice:
"Armament:
2 HS9 cannons (as a matter of fact HS404 were mounted) under the fuselage with ammo drums for 60 and 30 shells, + reserve ammo drums, 1MAC34 on a mobile mount for the rear gunner.
2 flares ("bombes éclairantes" under the fuselage (see the photo I posted earlier in this thread) et 2 landing flares ("fusées d'atterrissage) under the wings"
From March 1940 onwards (in fact they were delivered to the units in June 1940, during the fighting) the planes will be equipped with 4 MAC34 MGs in underwing gondolas
In the units, due to the shortage in cannons, the nose gondolas cannons were often replaced by machine guns (1 in each cannon gondola)
Sometimes a third forward firing MG was installed between these gondolas (same installation as for the Potez 633).
Sometimes a rearward firing MGs was added in the rear part of each of these cannon gondolas.
There was no inner bomb bay in this version.
Potez 633 is a light, biplace, level bomber. They have a single forward firing MG under the fuselage, to help the aiming in "vol rasant", and a mobile MG for the rear gunner
They can receive 2 or 4 MGs in underwing gondolas
On the 633, a vertical bomb bay (8x50kg) was installed on the export versions (Romania and China) and on the Greek export version an horizontal bomb bay was installed, enabling 50kg and 200kg bomb loads (most probably 4x50 or 2x200, as the fuselage was very narrow) - the bomb bay was on the centerline (not excentred as in the Leo45) and bomb bay doors opened to 135 degrees.
All this bomb bay installation was very cramped