Sig P365,There are some tiny 9mm's that would fit the "concealed" part of concealed carry very well. The Sig P365, the Walther PPS M2, S&W Shield 9, Ruger LC9S... and a host of others.
For something bigger and maybe easier to hit with - 1911's, the Glock 43X / 48 (that "single" stack Glock 19 we asked for 20+ years ago) Sig P225 or a 225A1, P239, a Sig P220, S&W 4506, S&W 4006... of course you could use nerfed mags in "hi cap" guns like we did before the Clinton ban expired. Many a fellow learned that for many guns, you could squeeze 11 or 12 rounds of 9x19 into a .40 magazine and they would function. ATF even declared it OK like the stupidity between a pistol brace and a stock, because the magazine was not *designed* for 11 or 12 rounds of 9x19, it was designed for 10 rounds of .40 and it didn't matter if you could shove those extra rounds in. Of course today's ATF fed bois would probably interpret things differently than their daddy's generation did, and who knows how hard you'd be boned by the state.
Just ask the poor bastards in New York, California, or Maryland what they carry.