10 round mags. They say on their website:
"FOR FULLSIZE M&P45, DOES NOT FIT M&P45 SHIELD!!!"
https://aimsurplus.com/smith-wesson-m-p45-45-auto-10rd-magazine/
"FOR FULLSIZE M&P45, DOES NOT FIT M&P45 SHIELD!!!"
https://aimsurplus.com/smith-wesson-m-p45-45-auto-10rd-magazine/