I think this is one of those it depends who you ask questions.
The guys at my local gun store reckon there needs to be clearance but you want it to be minimal, so you don't get scrub etc down there while you're out hunting and creating contact between barrel and suppressor.
On the other hand my Hardy suppressor that was fitted by them is rubbing a shiny spot on the barrel and is definitely contacting the barrel. 0.1 should be plenty.
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