KWA G19 Gas woes.

[Forever_kaos]

So I recently picked up a KWA G19 and love it so far but I've ran into some problems with it.

First problems I encountered were odd cycling/hissing issues.
I would fill the mag up with propane, pop in a few BBs slide it in and rack it.
It would fire off 1 shot but not cycle, it would hiss like a mad motherfucking snake is the best way I can describe it. Rack the slide and the hissing would stop. Repeat same thing.

I spoke with Tys and he told me to check the nozzle for any cracks. So I gave it a four or fifth over looking for cracks, even got the girlfriend to glance over everything with me as a second pair of eyes might be helpful. We both spotted no cracks anywhere.

Put it back together, the hissing died down. It was more like a poor baby snake trying to sound manly but the problem still persists.
(Guessing it was running low on gas as it stopped shooting as mentioned later)

Decided to take it apart again and get a 3rd pair of eyes to look over it, nothing as well. This time when I put it back together and tried again it almost, almost oh so close came to cycling fully.
It cycled about half way, still no new round and not able to fire unless I racked the slide but it almost did with no hissing.

Now it ran out of gas so I re-gassed it up and I'm now back to square one.

Won't fully cycle and hisses like a mad motherfucking snake.
I have no idea what to really look for, any advice is welcomed.
I wish I could get a video but my camera is being so horrible right now.

Thanks.

[sushicake]

Could be the mag. The back of the feed lips on KSC/KWA need to be worn down a bit before they work properly, well that was the case for my buddies KSC G32c