I think, no Criquet ever carried a rear gun, but the cabin of some of
them had the provision for it, as you can see in the photo Papa Lima
posted yesterday. And most of the MS.502, with Salmson radials were
in fact re-engined MS.500. And the F-BDXM had this cabin, too,
and it was was a re-engined MS.505 (with a Jacobs).
But thinking logical may lead into the wrong direction here.To install a
feature like this cabin afterwards wouldn’t make much sense, I think, but
perhaps this aircraft should look more “war like”, for whatever reason …