magazine not holding gas

[Matty321]

i have a glock 17 style gbb gun with a propane magazine... i think. anyway, whenever i try to fill the magazine i hear the gas going in for a short while then there is no sound . i thought that meant it was full but then i realised im only getting one mag out of it. anyway my problem is, what do you thinks the problem, and if there is one, whats the solution?

[Rock-climby-Dave]

1. hold the mag upside down

2. push gas bottle down fairly hard onto the mag untill it vents excess gas around the place you are putting the gas in.

3. if still not working, no idea.