Since the 1994 Assault Weapons Ban expired, we have seen a rapid rate of technological improvements in assault weapons, and that concerns me," Feinstein, a California Democrat, said in an email response to questions from The Associated Press.
"This replacement shoulder stock turns a semi-automatic rifle into a weapon that can fire at a rate of 400 to 800 rounds per minute," she said. Noting the strong existing federal regulation of machine guns, she added, "I strongly believe that devices allowing shooters to fire at similar rates should also be outlawed."
Well, just as 3-D printing and other fabrication techniques are rapidly making gun bans irrelevant (and doing the same thing even more quickly to magazine bans), a homemade bump fire stock is hardly an advanced engineering project:
YouTube, in fact, offers quiet a selection of videos about homemade bump fire stocks.
You lose, Senator. That's what the losers who wish to disarm the citizenry do. They lose, and therefore America wins.