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The main difference between the stock chamber and the PDI is that the PDI chamber has 2 hop-up arms.

I would go for the PDI Hard Piston made for the APS2. I think that'll fit the stock cylinder, but I'm not sure. I've heard PDI stuff is a bit different in size, so you'll have to look that up. I went LayLax for the short time that I owned my M24.
 
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