I bought this after going to a Tom Knapp show and fired like two boxes through it. It's threaded for Benelli/Berreta/Stoeger its goes in place of your choke tube and makes your gun a lot quiter. I never ended up buying a gun that was threaded for the barrel so thats why it was never used. They go for about $210 and I'll take $150 plus shipping and it's still in the box.
more info at http://www.metrogun.com/
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