gbb mag fires only a few shots

[poopoo12]

i put like 3 jabs of 134a gas into my mag and all i get is like 5 shots t'il it empties. it only started happening today, and yesterday it was fine, i was just wondering if it is a mag leak

[CDN_Stalker]

If you listen close after filling you'll hear a leak. Chances are yo udidn't fill the mag with LIQUID (aka. holding mag and can upside down) and only filled it with vapour (mag and can rightside up). That'll get you a couple shots before it runs out.

[Greylocks]

There is a set of instructions in these forums about caring for GBB guns. Read it, maybe there's something you missed.
I dont know who sold you a gun at 16, but that's another problem for someone else to fix.