I just dug out a couple for something coming up this weekend. They've been sitting unused for min 5 months (probably a bit longer).
I cannot remember how I had left them....but I suspect one had gas in it, since it was loaded with BBs too. The other was probably empty...of both BBs and gas.
Gassing them up yesterday...they both leaked right off the bat since they were dried right out. This is where MadMax's genius kicks in since his Impact grenade just screws apart at the top (like resetting it) and then you can pop the core out...wipe a gob of thick silicone oil on the two seals...and simply drop it back in. That's all I did and they both held gas immediately. Test fired them both...and then gassed them up and packed them up for this weekend.
So...bottom line...with his Impact grenades I wouldn't bother storing them with gas, just lube up the seals before you use them. And if I did store it with gas I wouldn't worry about it either...and just lube up the seals before using them.
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