KWA complete replacement cylinder for KWA A.T.P. style airsoft pistols. Can also be used to upgrade the discontinued G-series pistols to NS2 system standards!!Includes KWA Part Numbers:0004 - Cylinder,0057 - Jet Nozzle Pin,0071 - Jet Nozzle Spring #F-009,0003 - Jet Nozzle #A-001,