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Ok I have been doing some reading and I'm really confused by the different pistons. I know they are more sturdy for use with higher springs but do they add any FPS to the setup? Also what is the difference between the red and orange pistons? I assume one is going to have higher tolerances than the other but I cant even find that info!

Heres the Orange piston: http://www.uncompany.com/pageproductdetails.asp?prodid=22983

and heres the Red: http://www.uncompany.com/pageproductdetails.asp?prodid=3866

I have seen Vacuum pistons for the APS series but none for the VSR series. What exactly do Vacuum pistons do? Are the Red and Orange pistons vacuum pistons?

Sorry for all the questions.

sticks
 

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Orange one has to be used with a zero trigger group.

Red one has to be used with either the standard or upgraded version of the standard trigger group. (what I got in mine ;))

No idea if the 'vacuum' is a reference to the air pressure holes on the face of the piston or not :-/ all they do is increase the pressure of the 'O'ring on the firing stroke ( better seal ) and reduces the suction on the cocking stroke.

Hope this helps

VA
 

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The chrome thing with all the holes, thats a piston end, that is ;) so if you already have an 3 part piston that doesn't already fit then all you do is unscrew the end, screw the supplied item on and away you go
If you've still got the stock item I would of thought the orange piston would work with it judging by the look of the release sear ;)
 
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