Quote:
Originally Posted by aznpos531
I think the cheapest one I've seen is this one at airsoftparts: linky
it's long too 
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Yeap, airsoftparts.ca is great.
They sell a number of nice silencers for fairly cheap. They are all (or at least every one i have encountered) is foam filled. And, at least in the silencers i own, the foam is easily removable, leaving an empty space inside the silencer.