Yes it's always shot prone. Those rifles are over 5kg, so it wouldn't really be practical to shoot them offhand or to have a lot of movement with the rifle.
The rifle is tightly sling to the left arm, which is why they only reload with the right hand, even on the G3 where the charging handle is on the left side.
You'd want to use the much lighter Sauer 100, 101, or 202 that use the same action for anything requiring fast movement and offhand shooting.
I got the detachable mag thing from a knowledgeable person I trust, although I wasn't 100% clear how they came to that conclusion.
It could be wrong for all I know. Then again, I'm not a lawyer, so take it with a grain of salt...
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