On Tuesday, October 17, 2017 at 7:55:33 PM UTC-4, Oren wrote:
On Tue, 17 Oct 2017 13:12:28 -0700 (PDT), trader_4
wrote:

On Tuesday, October 17, 2017 at 2:55:59 PM UTC-4, Oren wrote:
On Tue, 17 Oct 2017 15:37:10 +0100, Bod wrote:

So this *bump stock* turns a semi into an automatic?

No, no and No. A stock does not change, alter or in anyway "modify"
the "mechanical" parts of the lower receiver. Bump stocks ONLY changes
how fast gases are released and how fast the bolt returns for firing.

That isn't my understanding. The bump stocks I've see have extensions
that run from the stock to the trigger area and serve to push the
shooters finger back and forth as the gun recoils. The effect is
to move the shooter's finger mechanically, back and forth, substantially
faster than a shooter could do on their own. If a similar mechanism
was placed inside the gun mechanism itself, so that it automatically
fired again after each shot, what would you call it? It's a similar
process and for a similar reason to full auto, to make the gun fire
faster than you can by pulling the trigger without assistance.

Fer cripes sake. Nothing for the original weapons design changed
except the stock, There are no forensics the shooter altered the
mechanics of the bolt, firing pin or any other damn thing. He bought a
legal stock. Didn't even put a full auto lower in exchange of a semi
auto lower.

Next you will be telling us how to throw grenades.

Fer cripes sake, read what i wrote. Where did I say anything other
than the stock changed? I was questioning your claim that it only
changes how fast the gases are released and how fast the bolt returns.
The pics I;ve seen, like the one I cited, show the stock has an
extension to the trigger area. You pull your finger back against
that extension, keep it there and then the recoil re-fires the gun
automatically. You're not manually moving your trigger finger
anymore. Gee, isn't that how full auto works, you keep your finger
pulled back, the gun fires automatically? Different mechanics,
but the same intention, to make the gun re-fire continuously.