One extra barrel.
New Positive Weapon Quality:
Combi-Weapon
Not applicable to Close Combat Weapons. Choose one of Penetration, Precision, Sustained Fire, or Torrent. For one shooting phase per game, the retinue gains the benefits of having two additional instances of the chosen quality. The various combi-weapons are the primary example for this, but other auxiliary weapons, such as auxilliary grenade launchers, or even disposable weapons for adding emergency firepower can also fit under this.