Wont shoot

[Mikey#1]

this is the problem with my mag. i gas it up but the thing wont shoot. the guys at the local shop say that there is something wrong with the valve but don't know what. it an 68 classic

[Chronobreak]

have you done/changed anything altely? tryed oiling it up ? check the valve for any broken o-rings

[tmnothing]

also make sure that the velocity is up high enough to overcome the spring. is there any pressure on the trigger rod when you air it up? do you have at least 800psi output from your tank?

[Mikey#1]

i will check all of this. thanks for the suggestions.