general description states: "attacks with your CHOSEN weapon..." but the benefit states "when you score a critical hit with A weapon...'
the prereqs only require a +8 BAB.
my question: is the 'chosen weapon' a specific weapon, i.e. corona laser pistol; a weapon class, i.e. all laser pistols; or a specific weapon type, i.e. small arms; or any weapon you are using at the time?
I think it's just the weapon you chose to wield at that particular time. I feel there would be a versatile critical feat or a note that you could take it more than once for different weapon types if it only applied to one weapon type.