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Discussion Starter · #1 ·
Hello everybody, I am currently in the process of figuring out the upgrades I want in my VSR and I have a question.

I know that the laylax teflon cylinder makes the bolt pull significantly lighter, does the PDI palsonite cylinder do the same thing?

Also does the PDI vacuum piston really make a great difference as far as accuracy goes? Or is it not really worth it?


Thanks in advance, Josh
 

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I don't know about the second question, but I believe that all of the PDI cylinders make the bolt pull lighter and can increase fps somewhat from their slickness. Honestly, they aren't really needed, I know fuzzy didn't have an upgraded cylinder, but they are pretty sweet to have when sitting in prone position which a fairly heavy spring. I think I am going to buy the raven set, unless you think the others are far better. Not to steal your thread, but does anyone know the difference between the VC and HD series of PDI stuff?
 

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VC= Vacuum. The piston is made for longer barrel rifles to push more air and reduce ''barrel suck''
HD= Hard. Just a normal ole piston.

As for the full cylinder kits, the only difference is the piston.
 

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The only thing that will make a bolt pull lighter is a lighter spring ;)

Both of these cylinders help make is a lot smoother. And there is a smoother surface for the piston to slide on when fired. So it doesn't get any "lighter" it just makes is slide smoother.
 

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Cheese Man said:
By the way, don't use the PDI piston. The polar star one fits, or should, and it seals way better, in my experience.
As far as I know, P* pistons only come in 7mm unless you order direct from them for a 9mm, the OD of PDI springs, or you buy it then send it in for reaming.
 

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Cheese Man said:
Mine was 9mm, I had a PDI spring guide in my type 96n and the polar star piston worked great.
Thats because the spring OD for an L96 is 9mm, for a VSR its 7. So the P* piston for the VSR comes in 7mm diameter unless ordered other wise.
 
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