If you're experiencing Projectile Dsyfunction (i.e. BBs rolling out of your barrel, or shooting with a severe lack of power), it may be due to a damaged loading nozzle, or a bad contact between the floating valve's plunger and the BB in the chamber (assuming you're still using the stock loading nozzle set).
Unlike the stock Western Arms system, the amount of gas used per shot by the Negative Pressure Nozzle Set is instead regulated by an independent valve inside the nozzle without the need for contact between a floating valve's plunger and the BB. Thus creating a steady output of gas regardless on how solid the contact between the BB and the nozzle, thereby reducing the chances of Projectile Dysfunction!
So if you're looking for a steadier output, whilst reducing the chances of misfires and other similar issues, the Negative Pressure Loading Nozzle Set is your perfect choice!