Having a hard time beating other players in PvP or difficult enemies in PvE within the Defiance game? You might not have a powerful enough weapon. This can be remedied by equipping mods to the guns you already possess. Mods can be used to improve the damage, accuracy, and even amount of ammo on nearly any weapon. Read through this Defiance weapon modding guide to learn more. It also goes over what nano effects are and how you can find weapons with them attached.