They are rare because they are out of production, most likely because the product was terrible.
TF11's are Co2 powered
I believe the Walther SG9000 uses Co2 but an 88g tank and not little cartridges.
there is a stocked version of a KJW M9 that can take Co2 mags, mod the internals and get an extended inner barrel covered by a suppressor and you could sorta have yourself a rifle.
The only other option I can think of is Co2 mags for GBBRs.
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