fn2000 will eject in any orientation. I've done it.... on purpose.
The round is captured by the "lifter" thru the ejection cycle and is prevented from re-entering the chamber area under the "toilet seat" (where the lifter is) by a small clip that the brass is forced thru into the ejection tube.
As far as why a gun wouldn't cycle in different orientations... probably because it isn't receiving the same counter-forces required to allow proper ejection aka physics as SgtGold pointed out.
(unsure about the KSG, but the FS2000 will run in any orientation)
Time flies when you throw your watch.
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