P90 Upgrade

I am thinking about upgrading my Echo 1 E90. I am getting a mock silencer, and a longer barrel to fit that silencer.

What I am looking at
- M120 Spring
- Cylinder/Piston Head (Silent)

Is there something else I should get, and Systema only sells version 2 and 3 cylinder and piston heads, whats the difference??

Ported and not? I dunno would needs pics.

Here are the things I want/talked about

Cylinder

Piston Head/Cylinder Head

To figure out what cylinder:

Cylinder Hole Location vs Barrel Length Guide Chart

As for the piston head it's a ported.

What is a Ported Piston Head?

A ported piston head basically has the same dimensions of the stock unit but has holes/ports on the front/top surface. Available aftermarket units are made from different materials such as aluminum or polycarbonate and have different number and sizes of ports/holes though they are equipt with bearings that prevents the spring form twisting. But they basically do the same thing, which is to prevent vacuum inside the cylinder (since the cylinder is "supossedly" airtight and it's capable of compression during it's forward motion, it is most likely capable of creating a vacuum and suction during it's backward motion. Very much like a syringe) when the piston pulls back and compress the spring for another cycle. The ports/holes act as pressure relief valves and allows air to pass through while the piston retracts, hence no vacuum.

A stock piston head can be ported and do the same job without the added cost (as long as you do not exceed the M130/SP130 spring power rating, anything above that, I would suggest getting the ones that have bearings for a longer spring lifespan). Using just the basic tools (like a hand drill) would be enough to port your own piston.

Now the question I have is that the piston head will fit in a P90 gearbox seeing how it says version 2 but the P90 is a version 6.

Yes it should fit fine stay away from:

Guarder polycarbonate piston heads.

Or just buy this:

http://www.airsoftgi.com/product_info.php?products_id=2261

Originally Posted by Computergeek2

Now the question I have is that the piston head will fit in a P90 gearbox seeing how it says version 2 but the P90 is a version 6.

+1 to Mr Cornerpedler,,have a look at this mate,,

Version 6 Gearbox - AirsoftWiki.org