Unless there's some new formulation to it "red gas" was HFC-22, which AFAIK is now a "banned" gas. You might have trouble importing because of that.
Looking at pics of how the 12gr CO2 canister "installs" (for lack of a better term -- that's f'n ghetto) it seems to be venting CO2 directly into a regular mag? Or is there extra modifications being done to the mag (like a pipe, to bypass gas sitting in the reservoir)?
Because if the reservoir can actually handle CO2 pressure like that, I'd instead suggest getting one of those Madbull CO2 adapters and just filling the reservoir up with CO2. Best of both worlds.