Or a drop of rainwater spanning the gap.
Interesting thread.
My contribution is what if you've got a heavy scope in a mount with inserts like the optilok ? Could muzzle jump allow the scope to flex down in the mounts for a moment ?
You might be able to see if there has been contact by looking at the finish on the scope and barrel after a few shots; see if its gone shiny.
I bet a paper thickness will be just fine. Whatever clearance is OK round the fore end will be OK above the barrel too.
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