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Originally Posted by porry
so you do not recommend an m120 spring in a stock gearbox? what if i cut a few coils off the spring? will that lower the FPS any?
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I don't recommend it with metal piston heads.
Why bother getting an M120 spring if you're going to cut coils off? Why not just get a lower rated spring in the first place?
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Originally Posted by JohnnyDo
To be honest I have yet to see anything documented or made into a theory as to why aluminum pistons and piston heads are made at all. With the ability to mold pieces as well as they do, machining seems to be more expensive and in the end cause more problems then solve. Ok aluminum piston heads may hold their shape better ... but by how much and how much of a performance increase would you see, then weight that against the disadvantages. *shrugs*
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Systema has documentation on this. It comes with each of their springs and gear sets, although they leave out specific details. Those details are obtained by taking part in "Systema training courses."
Metal piston heads are made for:
a) louder sound on each shot
b) increased feeling of "recoil" on each shot.
Aluminum pistons are made to:
a) slow down the movement of the piston
b) increased feeling of "recoil" on each shot.