It is not the inner barrel... it is a 1/2" PVC tube piece.
But, to get the best sound absorbtion possible, you just want to use some foam rings with different inside hole size. That will "catch" the sound waves and not interfere with the BB.
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Originally Posted by Drake
Damnit, don't make me add "no discussing temporal paradoxes" to the rules or I'll go back in time and ban you last week.
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