TM D.E. Gas filling problem

[Wildlife]

I received a shiny new TM DE hardkick a few days ago, it has the same issue. The mag does fill, but whilst filling, some (maybe 25%) of the gas is hissing from the fill valve like an angry cat with a snake on its head. (Yeah, crappy metaphor, I know. I'm tired; got nothin'. So shoot me.* )
So this is a common issue with TM GBB mags? I've inspected the valve closely, and everything seems well-made; no burrs or small gouges in the brass (caused by dull &/or galled tooling; I've seen plenty in KJW mag valves) that might explain it. Seals are nice & springy, everything fits well. My WA pistol mags all fill quietly with no leakage using the same AI propane adapter. I originally thought the (plastic) adapter had "broken in" to match the WA mag valves, and the TM valves were slightly different (mfg design & tolerances), leading to leakage. But that was just a guess.

I should mention this is my first TM GBB, always preferred WA; and (repeatedly knocking on wood) I've yet to break a slide using propane. Though I am obsessive-compulsive about cleaning & maintenance.

* : note to self; think of audience before sayin' stuff like this.

[Thenooblord]

TM mags have valve that hiss while filling, and spew gas when they are full, its the way they are

[Dart]

try moving the bottle around on the mag to find a "sweet spot" other than that don't fill it while smoking lol

[Crunchmeister]

Originally Posted by Dart

... don't fill it while smoking lol

Where's your sense of adventure?

[Wildlife]

Originally Posted by Dart

other than that don't fill it while smoking lol

Heh, I smoke like a chimney; not while filling though. (I know that a cigarette ember doesn't burn very hot, but still.. I've grown rather attached to my face.) Every now and then I forget to reset the valve catch on the WA mags and get a nice cold blast of propane to the crotch. :banghead: