you mean silencer? yes, they work, but results will vary based on the marker you're putting it on. makes a big difference on my sl68-II, but i don't have a ported barrel to compare it to. on a pro-lite or similar blowback, not much different than a well-ported barrel (marker itself makes a lot of noise).
they're relatively simple to make. someone machined a really nice one here not too long ago. i don't think you'll get people to sell them though; you can't do that anymore (changed the law; they used to be legal in the 90's). i'm sure other people will chime in on legalities, or just google it yourself (or search forum; it comes up now and then).
Originally Posted by alpha434
Barrels are like girls... Some people are just happy to have one that looks good. Or even one that everyone else likes. Other people want a tight, accurate bore to run their balls through.