NPAS GBB Negative Pressure Adjustment System by Cyma CGS Red Dot The spacing between the holes

The spacing between the holes on the lock is 18

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120bb Mid Cap Magazine M4 compatible

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NPAS GBB Negative Pressure Adjustment System by Cyma CGS Red Dot The spacing between the holes7075 aluminum CNC machined nozzle set for the CGS GBB system airsoft series, equipped with an adjustable NPAS valve that allows users to fine tune replica performance to current needs. It's a solution for airsoft players who want greater control over output and more consistent gas system operation. Operation & adjustment: This NPAS, Negative Pressure Adjustment System valve, allows regulation of the amount of gas directed into the system, which