OEM Hammer and Valve springs for FX Impact Power plenum models

Power Plenum (52cc)

Power Plenum 720

Power Plenum 750

52mm hammerspring and heavy valve spring

Heavy valve spring is only OEM for Power Plenum (52cc) all calibers/ all barrel lengths and the Power Plenum 720/750 .22cal 700mm

Heavy valve spring can be used to decrease Power on Power Plenum 720 and Power Plenum 750