Not sure if this helps you or not, but I fixed a couple WE mags I find that the ones in the Luger mags a poorly made, unscrew the fill valve, then with some good pliers carefully unscrew (don't crush or damage the body) the top of the valve (silver) from the bottom half (copper/brass) of the valve, you will have insides consisting of a spring and filling pin assembly with a small flat rubber washer. I expanded the spring to lengthen it (puts more pressure on Filling pin), then I put the valve back together... When you put the valve back in the mag place a small peice of teflon tape around the threads and ensure no loose peices are inside the mag.. where the propane fill spout hooks to the valve there should be a very small O-ring, mine seems to always fall out or blow off, replace that with a better version... You can find how to fix fill valves on the Net, but sometimes it's better just to buy new ones.... if you want some pictures I can take some and post them
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