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Don't see the need for CO2 mags. They're a pain, they're slow to reload. I'm sure they're spiffy though.
You can shoot as hot as you really need to by modding the propane system without incurring more stress to the system.
You can keep the system within the original operating parameters (not as much an issue on M4's as it is with SCARS).
You can mod the bolt and buffer/spring if you want more "kick".
All without CO2.
(plus I'm a cheap bastard and don't want to buy different mags that need disposable powelets that I'd have to buy)
Tys
BTW...I hope you use a real chrony to measure the FPS...pop cans are useless for that
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