First we going to show you some parts so that you got the idea what we are talking about.

gearset

  Reinforced gears can handle more power; the power of your motor towards your spring.

piston

This reinforced version can hondle more power so that the theath will not brake off when you are jusing a strong spring.

cilinder head & piston head

In combination with the cilinder it will give more fps.

cilinder head

nozzle

This piece is looking afther that there is no airleake between the cilinder head and the hop-up bucking.

spring

The spring dominates the power of your AEG.The stronger the spring the more fps you got. All other parts have to be in balance with it.

spring guide

By compressing the spring there will be a torsion power on the guidings of the piston; if there is a spring guide with bearings used the bearing will prevent the torsion.

HOP-UP seal of bucking

With this you rearange your hop-up. If this is worn out your gun will creat less power and less accurency.

bearings

Thes will take care of a betther guidence ( les recistence ) on your gears so the will have a higher rpm what means a higher  ROF.