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The Balystik spring kit PTW include a M90 non linear steel spring and 4 power rings.
Non-linear springs are easier to be pulled for the gearbox during compression. It comes with a set of 4 rings that fit on the spring guide. The more rings, the more FPS, which allows multiple powers with a single spring, or you can also refine the power depending on the length of your inner barrel. The spring chart will show you the power available with the M90 spring kit. the tests were performed with Systema M4 / CQBR inner barrel, Systema hop-up unit and Cylinder set. Please note, FPS data is a benchmark and may vary depending on the diameter and length of your internal barrel, and the seal of the hop-up unit and cylinder.
