full sizes Glock 22's on off duty cops, competition G34 and G35's.
The Mark 23 and DEagle have been posited to be an okay deterrent if they get seen by someone trying to start a fight with you.
But yeah, the Mark 23 is the work combination of weight and size to try, but it was seen in fiction plenty thanks to MEtal Gear and Burn Notice making people get creative if they were buffer than most.
Also IWB with a S&W .500 Mag is up there but not passably unwise.
Same with a Glock 18 with 33-rounder mag in the well from a guy I watch when I don't feel like being cheered up to annoyed by the likes of Hickok45 or Colion Noir.
They have done good for the gun community, but they are too political nowadays, when I just want to cheer up and look at some guns looking pretty on silk or cotton sheets.
Point being it's fun to imagine carrying an "offensive pistol" but if you look mean it won't look well.
That said a guy at a gun shop had a MK23 IWB once when quizzing me. I guessed USP.45. Close enough I guess?