Plexon .22?

This device uses a .22 plexon rws to power a captive piston . What is a .22 plexon ? thank you

I can’t say I’ve ever heard of a “Plexon” cartridge, but the device you show a picture of looks very much like an initiator for a blasting fuse; the top (complete) one is cocked, and the pieces below it would normally go into the plastic cylinder. The middle steel disc looks like it has a centrefire cartridge installed in it; does it have any sort of headstamp?

The device is a pepper spray item…The head stamp is RWS 22 PLEXON