It's not the MS410, though it should be 406;
"While the 406s were entering service in 1939, an upgrade series was started to improve the design. The result was the M.S.410, which included a stronger wing, simpler fixed radiator in place of the earlier retractable design, four belt-fed MAC guns in place of the earlier two drum-fed weapons, and exhaust ejectors for additional thrust. The added thrust boosted the top speed to 316 mph (509 km/h), an improvement of about 10 mph (16 km/h) over the 406.
Production had just started when France fell, and only five examples had been completed. Production was allowed to continue under German supervision, converting earlier 406s to the 410 standard, but many of these received only the new wings."
Still, DCG still only supports the two stock French squads, fr01 and NN. Shouldn't there really be more French squads in the stock game? I mean, honestly, hasn't the French community requested anything here? Am I missing something again?
However, tried the 410 out, can go anywhere, and with the two squads above comes out as French, but if you try and assign it to any of the other French squads (forgotten countries) they will come out as whatever the previously selected squad ID was, Russian for red or German for blue.
So yes, it's a limitation in DCG, if you look in the squadrons.dcg file there are only these two, new squads don't seem to work. Seems to be still hard-coded in DCG.
On the other hand I've created new gb squads with no limitations, so what's going on? Have to delve a bit deeper.
You can still have multiple squads though, use NN for fighters and fr01 for bombers and assign each squad individually in FMB or timetable.
fr0100 = fr0100 + fr0101 + fr0102 + fr0103 = 4 flights of 3 or 4 (i.e. XX00, XX01, XX02, XX03, squadron 1, flights 1-4)
fr0110 = fr0110 + fr0111 + fr0112 + fr0113
fr0120 ...
fr0130 ...
and the same again for NN using fighters, gives you 8 operational squads, so the Brits will have to fill in the numbers. (and/or use the 3 Dutch squads too?)