Okay, I went back and looked at the one link for the 'braces' on pistols that were originally designed as rifles.. ...
in other words best example is an AR15 that they cut down and made a long pistol, This would be a SBR. You need to start out with a pistol.
much like the Ruger Charger but much cooler looking and probably even less practical ..... So, with the AR pistol you add a rear adjustable stock and call it a 'Brace' and it seems the ATF says 'okay'... I'm suspicious of this. No, you add a "Brace" to it, NOT a "Stock". And I can see myself debating it with a ATF agent and sheriffs deputy on the way to the local jail... best case outcome is they find out they were wrong in anything from a couple hours to days.....You will go to jail for adding a stock to a pistol. You will not go if you add a Brace.
I have no experience with this other than I've heard from a good friend who is a licensed manufacturer of 'destructive devices' (this includes full auto) that half the time the ATF investigators/inspectors can't keep up with the rules.
9x19 I agree.... who knows what they will decide next..... I prefer to air on the side of caution these day.... I'm a little concerned that I have to fly into Las Vegas the end of Nov. with guns.... I assume the buearacracy will remain too large for me to be noticed.