I wouldn't lol
The KJW CO2 M9 comes with a reinforced loading nozzle for a reason, it also has a MUCH more significant recoil, sounds very close to a real firearm...
Anyway I tried to put a standard green gas mag from an HFC into the KJW and their incompatible, sorry I didn't have an KJW mags to check it out with but there's nothing different about them from other M9 mags, just a bigger plate on the bottom. The HFC mag clicked into the gun it just didn't fire.
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