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When shooting, yes. But not when the barrel/rifle isn't being used.

If you don't intend to carry the rifle with the supressor on (i.e. put it on when you get to a shooting possie) I would stick...

I had a look at the Zigliani supressors at the LR shoot in Feb (Gabe had one there that could be taken apart to see the construction). I was very impressed with it, and will get one for my 7mmSAUM...