Richard, that photo of the training aid certainly confirms the need for the tray access and in the photo here it shows the tray for the Besa gun and the need to "NOT" have an access on the other side. Perhaps this is why they used those two particular guns as they feed from opposite sides. I did wonder why they used two totally different guns. Perhaps some one can confirm that the Besa does feed from the right. Actually I think the Vickers feeds from the right or is the feed block reversible.
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