From New York’s new law, all magazines that contain more than 7 rounds are now banned:

 S 38. Subdivision 23 of section 265.00 of the penal law, as  added  by
   20  chapter 189 of the laws of 2000, is amended to read as follows:
   21    23. "Large capacity ammunition feeding device" means a magazine, belt,
   22  drum, feed strip, or similar device, [manufactured after September thir-
   23  teenth,  nineteen  hundred  ninety-four,] that (A) has a capacity of, or
   24  that can be readily restored or  converted  to  accept,  more  than  ten
   25  rounds  of ammunition, OR (B) CONTAINS MORE THAN SEVEN ROUNDS OF AMMUNI-
   26  TION, OR (C) IS OBTAINED AFTER THE EFFECTIVE DATE OF THE CHAPTER OF  THE
   27  LAWS  OF  TWO THOUSAND THIRTEEN WHICH AMENDED THIS SUBDIVISION AND HAS A
   28  CAPACITY OF, OR THAT CAN BE READILY RESTORED  OR  CONVERTED  TO  ACCEPT,
   29  MORE  THAN SEVEN ROUNDS OF AMMUNITION; provided, however, that such term
   30  does not include an attached tubular  device  designed  to  accept,  and
   31  capable  of  operating  only  with,  .22 caliber rimfire ammunition OR A
   32  FEEDING DEVICE THAT IS A CURIO OR RELIC.

I wonder what percentage of semi-automatic pistols accept magazines that have less than 8 rounds. Maybe subcompacts?