shootin problems

[EsPo]

im shootin my mag and all of the sudden one of the balls doesnt make it out of the barrel. i shot about 15 times be4 this happend. i think it isnt recharging. i also think that this is a bad on/off oring. any ideas. if i am right with the oring, which oring is it?

[TransMan]

Check your reg seat and make sure theres enough preasure coming from your tank.

[a_malfunction]

You might just be short-stroking.

[EsPo]

not shortstroking, balls do not make it out of the barel after a bout 15 shots and it make a thorp noise