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)