This is a modular cylinder unit for the SYSTEMA M4 & M4-A1 PTW only. For best results the M130 Cylinder should be used with the 9.6V Systema batteries. Cylinder Unit Includes Magnesium Piston and M130 Spring for 420 - 445 FPS . Swaps out with stock cylinder in seconds . Weight(Gram):189 (With Box)
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