Western Manufacturing GBBR issues

Hi guys, i have a western manufacturing GBBR and one of the mags out of the three i own doesn’t work properly it shoots about 5 shots then gas just starts shooting out the barrel and the side of the gun and wastes all the gas anybody has any similar issues if so i’m open to any info

Sounds like somethings up with the release valve on top of the mag, if it’s only doing it with one mag then that rules out the blaster itself.
Could be a number of things, shot o-ring, damage inside the valve, not enough lube etc.

Try putting a drop of oil in the opening at the top and with no gas pump the valve button a few times to work it in. If that doesn’t work than you may need to visit a shop with a tech knowledgeable with GBB stuff.