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I generally go for the bushing being 0.5-0.8mm larger than the barrel. But when fitted you want to see an even gap between bush and bore, the bush does not want to tip the suppressor. I have known...

It absolutely has to be threaded concentric to the bore, the projectile has to travel concentrically through the suppressor, really doesn't matter what the outside diameter of the barrel is doing.

I have fitted many, you do realise there should be a good clearance between the barrel and the bush. A great many barrels are externally not concentric to the bore, you don’t want exterior contact...