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Old September 10th, 2010, 19:03   #4
Kos-Mos
 
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Join Date: Nov 2005
Location: Lévis (QC)
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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