IIRC, they used to be reversed. Now it looks like they have the proper slot orientation:
Old:
http://www.thefirearmblog.com/blog/w...Az-660x319.jpg
New:
https://www.heckler-koch.com/typo3te...f205ae7a10.png
and
https://www.heckler-koch.com/typo3te...cd83ceaee1.png
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