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Discussion Starter · #1 ·
Can't seem to find a difference between the two online, just curious.

Have the HD for my VFC MSR, noticed the VC cost more on the PDI website.

Also, anyone have a source for 90* piston ends? Have a Springer trigger..
 

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The HD stands for hard I believe, which is just a flat face.
The VC stands for vacuum, which is silly.
With that one there's a big hollow cavity in the front of the piston that is supposed to shoot air into your O-ring and expand it faster, but I don't think that it's worth the dead space in the system. I haven't heard actual use from it, but I think it didn't do anything special.

If you look at Maple Leaf, Laylax, or Action Army, or AEG pistons they have lots of little holes in front of the O-ring for the same purpose, but I think they work better than a huge hole since there's less dead space to ruin compression.

Not sure where to get piston ends, but PDI is rather hard to get ahold of these days so you may be out of luck. The Laylax pistons are good but are a bit difficult to get, but I think that the SSG10 weighted piston may be a go.
 

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Avoid the Vacuum piston at all costs. It was a cool idea but never worked right.
 
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Discussion Starter · #4 ·
The HD stands for hard I believe, which is just a flat face.
The VC stands for vacuum, which is silly.
With that one there's a big hollow cavity in the front of the piston that is supposed to shoot air into your O-ring and expand it faster, but I don't think that it's worth the dead space in the system. I haven't heard actual use from it, but I think it didn't do anything special.

If you look at Maple Leaf, Laylax, or Action Army, or AEG pistons they have lots of little holes in front of the O-ring for the same purpose, but I think they work better than a huge hole since there's less dead space to ruin compression.

Not sure where to get piston ends, but PDI is rather hard to get ahold of these days so you may be out of luck. The Laylax pistons are good but are a bit difficult to get, but I think that the SSG10 weighted piston may be a go.
Main issue is there are no aftermarket parks for the MSR outside of PDI, was sad to hear of their bankrupcy
 

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Actually, the vacuum piston works as intended. Just does not work right with High FPS builds.
 
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