i just picked up the Impact Grenade and posted the same question here. When filling i get a venting after a couple of short fill bursts. I am not sure if it's filled all the way and simply venting any over fill.. or if it's actually leaking right out of the box. .brand new ..
At first i used Green Gas with a metal nozzle and now i'm using the same Madbull metal Propane adapter.. both have caused this venting. Could it be the metal fill stems in these types of adapters?
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