new owner of used gun need help!

[Lullen]

Ok i was recently giving the origianl 68 auto mag now i have never used this gun nor one similar well when i took it to a friends to try it out i hooked up the Co2 tank and it proceeded to blow straight co2 out the end of the gun if anyone can tell me what i need to do to fix this i would be greatly appreciated :D

[Thermus]

Try pttuing a few drops of oil in the ASA and let in run for a few seconds so the oil can circulate. If that doesn
t work, take the valve apart and look for a blown o ring.

[Dayspring]

If it blew air out the back of the gun facing you, take a 1/8" allen key, insert it into the hole and turn counter clockwise. This is the velocity adjuster, and the reg is being over-pressurized. If this doesn't solve the problem, you may need to replace the piston or piston oring.