Typically an OPS silencer has sunk in thread so that it covers part of the barrel and most of them attach to the iron sight on an Armalite. That's why I'm surprised that his seems to fit so weel on a SOCOM 16.
That's very odd about the CYMA's lack of thread... where did you order yours from? And Evilliboba, where did you get yours? I really want one, but if it doesn't have a threaded barrel I might have to turn away. BTW, your avatar is awesome!