G&G SR-25 Spacer for M4 Chamber Conversion Air Lines The CO2 configuration comes with

The CO2 configuration comes with a different rail that allows it to accept our 12g or 33g CO2 Inserts which makes it possible to use traditional Milspec buttstocks*

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If you've ever spent hours shimming a gearbox shell just to have your nozzle tilt

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G&G SR-25 Spacer for M4 Chamber Conversion Air Lines The CO2 configuration comes withThis delrin spacer allows the G&G SR 25 (GR25) to be used with traditional M4 series hop up chambers in place of the original proprietary chamber. Only compatible with the Fusion Engine.