40mm Bofors gun operation mechanism question

[Tony Smith]

Originally posted by Godwin Hampton
Two grooves and apertures are provided, one on each side, so that the clip could be loaded facing any side you like. Some British Army guns had the right aperture sealed off, but the reason for this eludes me.
Godwin

When the 4th round is unlocked, the clip falls out the side opening in the Autoloader.

The 2 apertures only seem to have been used on Naval guns, as all the Army Bofors I have seen only have 1 opening on the left side of the casing.