Look closely, to the picture to the right: "legal to own and use."
What that stock does, is change a semi-automatic weapon into what I refer to as a "loop-hole legal machine gun."
Now, I'm not going to get into a circular argument about definitions; about what a "machine gun" & "sub-machine gun" & "automatic weapon" are and are not and other odd, assorted semantics ("it's not called teh clip; it iz teh magazine!!").
What I am going to point out is that sometimes, as most rational people know, technology DOES change - and technology has changed what an assault rifle is and what it now is legally capable of.
Watch the following three YouTubes - yes, it's going to take more than just a few minutes - and then, in the comments, tell me what you think of what you just saw.
I've thought about this for quite a while, and here's what I believe: any semi-automatic weapon that can be legally modified with a slide-style stock needs to be banned.
Excuse me: EVERY semi-automatic weapon that can be legally modified with a slide-style stock needs to be banned.
I know the Thompson submachine gun was banned decades ago; I believe it's time to ban these loop-hole legal machine guns too.
This YouTube shows how to "bump fire" an AR15 without a slide stock:
This YouTube shows bump firing at the next level, with a slide stock:
This YouTube shows how easy it is, to put together the loop-hole legal machine gun:
Semantics? Could care less about 'em. These are loop-hole legal machine guns.