Asura.Melliny said: »
Most older weapons had that trait, where things that affected critical hit only worked for the weapon the stat was listed on.
Its the same as other unique stats like TP Bonus, or Naegling's Attack Bonus not working with Ranged WS. Unique stats ON a weapon generally only affect that weapon type. Augments, however, follow a separate set of rules and do work across weapon types.