BD Bore Up Cylinder And Cylinder Head Set For V2 Gearbox M4 M16
Suitable For AEG Version 2 Gearbox
Material: Stainless Steel
Increased bore size means greater air capacity and volume for propelling the BB forward.
This is a highly recommended upgrade for AEGs 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.