Wait! Don't release the patch just yet!
This just in:
The gunsights in Ki-43-II and Ki-43-II-Kai behave differently than other similiar gunsights. When you move/tilt pilot head up, the yellow reticle is drawn on the top edge of the gunsight. Probably left and right edges too. In planes like Ki-61, Zero, Ki-45 (well, the lower sights at least) and Ki-84, it isn't! Ki-84 has a peculiar area for the reticle to be visible, move head left and right and you'll see. Could there be an oversight in the Ki-43 sights?