I'm no expert, but I believe that preferred method would still be to thread the outside of the barrel and use female-male adapter fit perfectly flush with the barrel inside the slide, with the male end projecting out for the supressor.
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.