Originally Posted by bigred76
Take off the barrel and hopper. Put two drops of good, synthetic paintball oil in the ASA while tilting the barrel end down, and screw in your tank. Fire approximately 15 times this way. It's going to be loud, so it's preferred to put a towel or the like over the end of the body where the barrel screws in.
do this ^^^^ First.
if that doesn't work pop out the valve body and inspect o-ring for damage, lube up and try again or replace the clear o-ring with a tank o-ring.