just a tip, the above silencer can be improved no end. especially if you are useing it on a gun with a floating barrel, like my spectre. the end that threads to the gun, is made out of a great big lump of solid ally. if you have a lathe, or access to one, you can bore this bit out. just dont do away with it all together, as then all the internals will float about. aswell as makeing another large chamber to help quieten things down, a handy side effect is the loss of some unwanted weight. i would imagine that the long version of this silencer is constructed in the same way.

hope this is of use to someone.

cheers
Ben