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Not every KJ M9 can use Co2, I believe the Co2 versions have reinforced internal components to allow the pistol to handle the extra wear generated by Co2. A Co2 version M9 should be able to use both Co2 and regular green gas mags, a regular version should also be able to use both but due to the lack of reinforced internals the use of a Co2 magazine could possibly cause damage.
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"Its only a little bit on fire"
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