Advanced Weapon Effects, also known as "Trails", are upgrades for advanced weapons which add a unique smoke or "missile trail" effect. They are normally available only at the Cash Shop.
Advanced weapon effects can be applied by purchasing the Advanced Weapon Effects item and combining it with the weapon at the Factory. (If a player wishes to remove an Effect they can purchase an "Original" Effect item and apply it in the same way - which will restore the weapon's default appearance).
As of Episode 4.5, advanced weapon effects now give +20% ammo capacity.
Currently only advanced weapons (not standard weapons) have unique effects available.
List of effects