High pressure piston, is it needed?

[Greg711]

http://www.actionvillage.com/011-1000-250.html

This is the link for a product at paintball gear. Its a high pressure piston for when you have nitro in your automag. Is this needed? Does it work? Im just now getting HPA on my gun and was wondering if this would help somehow.

[BlackVCG]

Get your HPA system, test it out and as long as the gun operates without leaking out the back when you're shooting at 300fps, then you don't need it.

[Tunaman]

...and if you do need it, dont get it from there. They may be older ones and probably wont work with some level 10 issues. Get it from AGD.