Q: Is stunning of an animal with a bullet alloed?

A: Stunning  as depicted by you is not allowed.

In accordance with scholars that are neither generally affiliated with slaughter houses, nor scholars affiliated with compensation from such places, it is agreed upon that stunning is inhumane and in contradiction with the aspects of Islam that are concerned with the humane treatment of all of Allah’s creations. Such meat would be impermissible for consumption.

Allah Certainly Knows Best.