Don't replace the crappy WE fill valve with another WE fill valve...
Since the original batch had issues with the fill valve leaking (getting stuck open)...I've used some Madbull SS grenade fill valves. They don't quite fit (the head is larger than the opening of the fill valve whole)...but I've just screwed them in and they seem to hold gas ok (I've done 6-8).
On others...I've taken a MB SS grenade fill valve...put it in my lathe and turned down the head so it'd fit the hole...works like a charm. I would have done all my other ones except that they haven't leaked at all.
Airsoftparts.ca.
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