Fps Ergal head set for Scar L electric gun (hi flow)

New improved set with enhanced flow aluminum dual oring piston head with ball bearing
hi drain cylinder head with enlarged cylinder oring 
ergal nozzle with internal oring included
this set will detect the air flow from the middle of the head pushing it to teh bb
making your gun shooting faster even without changing the spring

for Marui Scar L electric gun series and compatible