Yes very cool, I'm not seeing anything about them being CO2 though. Maybe I'm blind? You did link to a page with several gun links.
Ideally, I've always wanted the RA-Tech, WE M14 EBR, Open Bolt, Level III, in a CO2 gun. I'd do the silencing mod, and DMR the shit out of it. I'd get a custom decal for the side that says "head shot cannon".
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