There are many reasons would result in such a problem
1. If there is stuck between the loading tube and the barrel, thus causing "blank fire" ?
2. If the motor of the gun is too fast while the e-mag loading speed can't catch up with it ?
By the way, u 've post to a wrong forum.
plz post the relate topic into 氣槍維修站.
射擊之道: 起射線上,無情,無欲,無念.射不動心.有欲之射,必成濫射;無欲之射,方成精射;無射之射,是為至射也.