Systema Bore Up Cylinder Type-3 for Tokyo Marui PDW
Metal Construction
Design For Upgrade the Original Parts
Suitable For Tokyo Marui PDW Series Airsoft Rifle
with lengthened barrels since you will need additional volume of air to propel the BB out of the longer barrel - to avoid back-pressure.
These bore-up cylinders actually have the same external dimensions as a stock cylinder so they will fit into a standard gearbox.