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The difference between the CO2 and propane version is in the gas system. Otherwise the two versions are identical. CO2 version is fully backwards with propane, propane version has difficulties with CO2. Technically all newer versions are CO2 versions, not really much point in building both propane and CO2 versions.
Rear plate are suppose to be all reinforced with steel on the newer version, according online chatter.
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"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."
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