two problems I can think of off the bat;
1) The two inner barrels would have to mate exactly, otherwise the bb would end up being deflected off the leading edge of the 2nd barrel. Most likely not too hard to do, just make sure both ends are chamfered.
2) when you put the silencer on, you would be increasing the volume of air inside the inner barrel, and you depending on the total length, would more than likely need to change out your cylinder to a non-ported model.
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