A silencer on a GBB is best left on only for show. It has provides no useful sound suppression, so it's only cosmetic, and it will definitely stress the internals by hanging a big honking weight off the end of your gun. Not a wise idea for field play.
Strictly speaking I don't think you'd want a vented barrel with a suppressor? I'm just theorizing, but I don't think in reality that would be a very useful combination.
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