I have to agree that a pistol round powered carbine is most useful. And, that mags of only 10 rounds are certainly going to be a show stopper with these.
The audiable report from one of these carbines is most great while doing varmint clearing out in the country. A 9mm is almost just as loud as a .22CAL less the sharp air crack. 124 GR is a tab bit slower and is a bit less noisy.
32 RND UZI mags machined to work in a 9mm AR15 are easy to FAB up on a milling machine. Or, these can be purchased from c-products pretty cheap.
Maybe TAURUS will come around to better pricing along with better mags as an option to those of us who still live in more gun friendly states?
If not, I will just keep using the AR15 and UZI 9mm carbines.