...
to sum it up, bumpstocks now fall into the camp of lightning links??
Almost... The LL did change the trigger action to mimic that of a full-auto gun. With bump stocks they had to say that somehow having a recoil operated assembly around the trigger did the same thing, even though you still only have 1 trigger 'operation' per bullet.
What's really sad is that the ATF could have avoided the whole thing in the beginning by simply asking SlideFire to add a latch or a cam that had would allow the 'pull to fire' aspect to work, but prevent a second shot without some kind of effort. It would have still met SF's stated goals, but would have made it useless for bump fire. I guess that's 20/20 hindsight, but the ATF really rotated the pooch on this one.