Many small arm Las-weapons are capable of switching between power settings to better combat certain enemies or adapt to certain situations.
Black Crusade[]
This weapon specialy rule is not listed with the weapon qualities, and is instead found under the entry for the Lasgun. Despite this, several weapons benefit from this rule.
These weapons may be fired on overcharge mode, gaining +1 damage but using 2 ammo per shot. They may also be fired on overload mode, adding +2 to damage and penetration; but using 4 rounds of ammo per shot, and loses the Reliable quality, and gains the Unreliable quality.