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Will not work for grenades. Will only work for pistol mags if you have a remote line feeding it.
Replacing CO2 with HPA in a closed system like a grenade will fail if you attempt to pressurize it to a useful pressure. Expect blown seals and valves and a pathetic end result. HPA is compressed air and you are limited to the internal volume of the grenade. The expansion of compressed air is far less than that of CO2.
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