Originally Posted by cetane
If you feel pressure on the discharge valve it's enough gas. I usually leave them full filled...
Leaving magazines empty has never failed to make them leaky after just a few weeks. I've never had a magazine deform, but I don't leave then lying in the sun. Then again, I don't leave bottles of green gas, propane, or anything else that's under pressure in direct sunlight either. I have always left mine half full to full. Give a gentle push to the discharge valve, on the back of the magazine, if you can't push it in easily, then there is gas in there. If it pushes in, then there is none, and if gas comes spewing out, you pushed too hard. lol