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 - We have done all the hard work and spent a lot of money in research for you and these parts that I am now selling are the best.

 - Gel rifle spring upgrade

 -1.5mm  spring.

 - Increases feet per second!

 - Good for your motor while providing plenty of pushing power.

 - The choice spring for comp play.

 - Fit for: jinming M4, Scar, MKM2, HK,AK12, M4a1, gen8/gen9/gen10 etc

 Package 1 included:

1.5mm spring

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