A concealed holster gives a -20 to find the weapon, but turns the ready action from a half, into a full action
The Quick Draw talent changes the ready action into a free action for pistols and basic weapons as well as for melee weapons that are used one handed.
How do these two talents interact? Does one trump the other? I personally would go that the ready action is halved (normal ready = half -> free), so (concealed ready = full -> half).
as a side question, for a compact weapon in a concealed holster, do the difficulty effects stack?