Pretty much what the title says, but to elaborate: Monofilament weapons and K1 ammo have been removed as ammo types in N4, now only being defined...
The manual says: "In the case of the Monofilament CC Weapon, its Traits indicate that the target will have their ARM value reduced to 0 for their...
On the martial arts chart, it states that MA levels add additional damage to the attacks however, under the charts detailed information (page 67)...