Same things I've carried all along, even when I could carry whatever I wanted off-duty as a CA peace officer, meaning either one or another of my 5-shot snubs, or one of my .380, 9, .40 or .45 pistols that use 6, 7, 8, 9, or 10rd mags.
There would be a minimal effect on me, if I lost the retired peace officer exemption that allowed me to keep my 12rd mags for my SW9940, as then I'd carry the 10rd mags I have for it all the time, instead of only occasionally.
I have an early production M&P 45, which I consider to be a "hi-cap" .45, with its 10rd mags, since the rest of my .45's use 6, 7 or 8rd mags.