https://www.youtube.com/watch?v=cwioSefgcsM

Tanegashima were very ingenious peoples.. In term of fire arm..

https://www.youtube.com/watch?v=zoNUgQZ-wf8

Is it possible that flintlock have been used? And I mean massivly used...

http://guns.wikia.com/wiki/Breech-loading_Matchlock

This is certainly not a thing but.... Flintlock? Yess..... It mean quicker reaction time and reloading.
It make the last minute volley strategy easier.