Systema New Bore Up Cylinder Set for MP5

Description

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. FOR AIRSOFT USE ONLY