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I did a little research and found a website that will put in a m120 spring, aluminum piston head, and shims (whatever that is) for $68 dollars. Is that a reasonable price. They said it would increase the FPS from 330-3360 to 3370-400. Is the FPS also reasonable. ( someone already said that 400 FPS was pushing it so I just wanted to make sure the upgrade was for real)
Last edited by airsoftnoob34; March 29th, 2009 at 21:08..
Reason: error in text
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