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Take it apart and try sliding the piston (ok, the next one definitely) in the grooves on the inside of the mechbox. If it's like what I experienced with a Guarder FTK in a V2 Hurricane reinforced mechbox, the piston's side grooves were too tight on the mechbox rails. What happened after I upgraded it but before I found the problem was (go figure, I fired off 6-7 locaps through the M4, shot great, Shagg got it back, it cycled twice then siezed), so once I discovered this I used a sharp but small chisel and shaved plastic off the insides of the groove til both sides slide smoothly.
I know that isn't your problem, but it is a though, because if the piston decides to seize yet the gears keep turning, you can royally fuck a piston pretty easily (hey, I've seen two polycarb pistons break in the past 4 months due to the hop up rubber going kaput. Different guns too, although same owner! :roll: )
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