Oil is the answer, I've dealt with numerous occasions of people saying the gas spews out in one lump amount, every time I tell them where to oil, it fixes it.
Remove the slide. Put your thumb over the hammer, pull the trigger and let the hammer drop carefully. You'll see the little part (#78 I think, not sure) that hits the mag's release valve. Dump a good amount of silicon oil on the axle of this part, and oil in other areas around moving parts in the gun. Repeat the thumb over hammer, pull trigger thing numerous times to work the oil in, then put the slide back on and shoot it.
Also, hold your empty of gas mag face down, put a good drop of oil on the release valve button (rear), then press and release the valve numerous times. Could be your valve is sticking as well.
Let us know what happens.
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