Available from Barreta.
Available from Ruger.
Why 9 mm?
My guess is that, like 5.56 and the AR-15, it’s a relatively small, but widely popular caliber. If they can ban those, then it only makes sense to ban the more powerful cartridges, too.
I went to Walmamt, yesterday, for the first time in about a year. Thare’s still a gaping hole in the ammo case, where 5.56 and 7.62 used to be. On either side were handgun cartridges. Lots and lots of 9mm. I guess the AR-9 isn’t a thing, yet.