Right sorry, forgot to say how I was installing them. These aren't the internal orings that retain gas, it's the tiny ones on the outside that seal against the propane adapter. Sometimes they fall out on their own as they're only held on by friction. I'm installing them by using a toothpick to place it level and center on the nipple and using a propane adapter to push it onto the nipple.
I suspect there are a few different sizes used on gas mags as these ones worked for other people but not for me. They are too thick so even when I do manage to get them in there nicely they cause the nipple to stick and gas to leak out.
I'll try to buy some orings today from my local shop and if they fit I'll post what measurement they are and hopefully a bulk catalog number.
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