Did a Google search, and this is all I found:
http://www.newscientist.com/lastword/answers/
586gadgets.jsp?tp=gadgets1 http://guns.connect.fi/gow/silencer.html
http://www.att-tactical.com/awc.html http://www.gem-tech.com/twenty2.html
The first site states that it is not possible to silence a revolver. The CIA modified Dan Wesson revolvers for their operatives back in the 60s. This wqs possible because the Dan Wesson had an adjustable cylinder gap, and they adjusted it to seal the gap, eliminating gas leaks and noise. Most (98%) of the hits were from sites explaining the illegality of possesion of the silencers. Several books are available on the subject. Hope this helps some.
Bob Anderson
Politicians are like diapers and need to be changed for the same reason.