The French Wildcats were shipped without armament, with the plan to put 7.5(?) mm guns upon arrival, no? The Brits installed .50s themselves on those planes, so far as I remember reading about.
Only a handful were delivered that way. It would have taken a lot of work to fit an 8 gun .303 armament to a Martlet. Why didn't the French go with the .5in? Why did they feel that the 7.5mm was the better gun?