Discount Systema New Bore Up Cylinder Set for M4-A1
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.With Systema's Bore-up Cylinder Set, the double-bumper system employed to both piston head and cylinder head prevents the case from breaking. It is recommended to use a M120 spring or stronger.Most suitable for use with Marui standard gearboxes. FOR AIRSOFT USE ONLY
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