These tests were all done in Local Play by freezing the bots using the debug menu, and the current hitreg issues don't affect local play, so while I'm pretty sure these stats are accurate it can't hurt for other people to test it as well.
I posted this on the Discord earlier:
Against Heavy Armor:
-> Makarov = 4 shots
-> Hi-Power = 4 shots
-> M9 = 3 shots
-> M1911 = 3 shots
-> Tariq = 3 shots
-> Glock 17 = 3 shots
-> L106A1 = 3 shots (but it takes one less leg shot to kill vs the Glock)
-> M45 = 2 shots
-> There's no reason to use the M1911 since it's worse than the M9
-> Hi-Power does the same damage as the Makarov
-> Hi-Power costs the same as the Glock, which is superior in virtually every aspect
-> M1911 costs the same as the M45 but the M45 kills in two hits while the 1911 cannot
-> L106 is a better M9 (but it costs more, so that's kinda balanced)
Insurgent pistols either need a buff to stats or reduced prices if they're that uncompetitive to Security pistols