KP-07 can run GG and CO2. I've owned the WE MEU (same type of 1911 as KP-07) and sold it to buy the KP-07. I've since picked up a second KP-07.
Definitely go for the new model CO2 mags if you're going to run CO2 as your main propellant. Better seals, lighter weight and lower profile.
Fantastic gun
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