As you use one weapon for a long time, you develop a habit. With each new hero level your habit increases up to the maximum value of 10. The habit grow speed depends on the weapon you have; with some weapons (pistols, SMGs, primitive) habit will grow fast, and with others (plasma, launchers) it will grow slow. Habit improves a number of weapon stats, such as damage, range, and accuracy. When you pick a new weapon, your habit drops either to 0 (dirty switch) or to 50% (clean switch) of the previous value. To perform a clean switch, the next weapon you take should be from the same class (pistol to pistol, shotgun to shotgun, etc.) With Specialist perk, the one Lucy starts with, you will gain habit twice faster.
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