I store mine with just a tiny bit of gas. After every game i also put grease on the o-ring and the bearings. Takes a bit of time but its better not having em work.
Not sure if this helps but out of the 20 nades I do have only 1 has completely gone crap. I find the most annoying thing is replacing the fill valves. I run the cheaper ehobby shells and almost of of them had to be upgraded to madbull valves.
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