So far the anti-gunners succeeded in shutting down the Hearing Protection Act and other legislation. They will fight tooth and nail. Eventually we will win as Suppressors are not actually themselves firearms and certainly not "dangerous" in an of themselves. Current rulings from the Supreme Court show that weapons must be both "dangerous and unusual" to prohibit them and silencers are neither of those things... making the NFA with regards to silencers unconstitutional.
Not that I would recommend doing anything illegal, but there have been books floating around the internet for many years showing exactly how easy it is to manufacture your own. The mafia publicly confirmed that they just make their own.