Description

Double Bell Magazine AM45 Vorpal Bunny Gas Magazine (18 rounds – 7961J)
 
This cracking little handgun uses little magazines, so be sure to grab a couple extras to keep you in the game longer. The base of the magazine doubles up as a kind of grip extension for added comfort.
 
Gas Mags 
Note* When filling the magazine with gas, there’s a few things you can do to help keep it working properly and ensure they last as long as they should. 

Hold the magazine with the fill valve facing up. (usually on the bottom of the magazine, sometimes on the back)
Insert the nozzle of the gas canister and push straight down. Gas shouldn’t spurt out of and around the valve, it should go straight into the magazine.
Listen for the hiss inside the magazine as it fills. It’s usually quick and then stops. When it stops, stop.
With a pistol mag fill 3-5 seconds worth of gas. With an extended or rifle mag around 7-10 seconds. This gives you enough while preventing you from over filling it. When you over fill, usually the first shot releases too much if not all of the gas, which cools down quickly and prevents the gun from working properly.
Never ever ever release the gas from the magazine via the knocker valve with the mag out of the gun, the only thing that should press that button is the firing pin.
And Finally, always store a bit of gas in the magazine. Maintenance gas (Abbey 144a) or green gas that contains silicone lubricant (most do) This will keep the seals tight and stop them from drying out and failing. 

So to recap that… Gas in, fill downwards, just a few seconds, only release it by firing it out (dry firing with no BBs is fine) and always leave or put some in for storage. Gassed mags are happy mags.