Why didn't you just copy and paste a quote of what I said? Oh, I know, because you can't tell the truth. So with that in mind, here is what I said:
Haven't tried a .40, but have tried a 9mm Colt 635 and the muzzle flip from 9mm seemed worse than 5.56 out of a 14.5"+phantom pencil barrel so .40 should jack that up even more.
Unless you are shooting on a range that doesn't allow rifle ammo, I really do not see many perks with a 16" pistol round carbine.
Interesting also that you show us a video where the muzzle is moving quite a bit to show us something with(according to you) the same recoil characteristics as a .22LR.