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The Maruzens & its clones definately wont take CO2, the mags are a weak 2 piece design that barely holds propane and the guns internals need some modding to even run propane.
The old Escort MP5s were HPA so it could be a conversion of that.
The only other thing out there is an Umarex MP5k co2 but thats .177 steel bbs so definitely not airsoft, unless he modded it re: same
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