fondled one at a gun show recently. yes it is a bit bigger than the glock 19, but as someone who conceals a sig 229 on occasion, I believe it would be very possible.
also one huge advantage the FN has is that it is extremely light for its size. when I picked this thing up I was shocked at its lack of weight. It sort of makes the gun feel cheap in a way I guess, but I would say as a whole this is an irrelevant impression.