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Hello All, I have had a CYMA M14 for around a year now, have only played with it a couple times as I have too many guns, I decided to crono them all the other day and noticed that it was only firing around 260FPS. Since then I have opened it up, and noticed the Piston had lots of wear, so ...

As you can see in the pictures, the spring will pop up or down, sadly I didn't realize this when I first put the gun back together, it only cronoed at around 150fps, the spring is meant to put out 350fps so I'm hoping this is the issue, as the gun was working fine before hand