I called HK parts and they say that their 3 lug mounts are not made by griffin.
However, they acknowledged that they have had users have these issues who own the Rugged Obsidian this year and said there could be enough variation in the 3-lug adapter length to cause the issue.
They have offered to send another unit to me after I send mine back to test out and see if I have more success with it.
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