Fps Ergal/POM cylinder set for AK47/74 standard electric gun (hi flow)

New improved set with enhanced flow ergal dual oring piston head with ball bearing
hi drain cylinder head with enlarged oring 
POM nozzle with internal oring includedsteel polished hi pressure cylinder 
steel polished hi pressure cylinder 
suitable with 451mm at 550mm
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 AK47/74 electric gun series and compatible