External hammer
Trigger capable of DA or SA fire
A rotating cyclinder that holds the cartridges, no less than 5
Barrel between 1 7/8" and 3"
Capable of firing .38 Special, .357 for a bonus.
Part of being dumb is you are eventually dumb enough to slowly acquire some wisdom hopefully. With enough problems and waffling I've come to prioritize availability above all as the best ability. A gun can be exceptional at all 5 of those things but it's meaningless if not on my person. This has become #1 for me now when considering a carry gun.
From Experience .
#1 - It has to be on your person .
If the gun is Too heavy , too bulky , too uncomfortable , too whatever the reason ... not to have it on your person , all day , everyday, then that gun is unsatisfactory .
The gun that goes with you , out the door , every day and stays with you , all day is the the one you want .
Having the gun on your person ... is THE Most important thing ...
#2 Importance ... shooting the gun accurately (in a gunfight only hits count) .
Gary
And, fwiw, my comment on accuracy: It takes an incredibly poor gun or incredibly poor sights or an incredibly poor trigger on a gun to avoid adequate accuracy at self defense range.
Inaccuracy at self defense/gun fighting distances is mostly folks getting excited and jerking the trigger instead of pulling the trigger.