i have a kjw taurus m9 cybergun model and after awhile part #24 broke in the blow back unit. The blue nozzle slides in and out of this part. it was cracked inside where the safety slots through so for a while it functioned still broken then i started having problems like you mentioned. The first bb would shoot and the slide wouldn't go back full cycle, unless i used a brand new co2 and once the co2 ran out of pressure the slide no longer would kick back and just partially cocked the hammer.
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