I need help with reversing an animation.

I am currently editing a mod. This mod has a rifle and that rifle uses the staff animation for some weird reason. I have edited it so it uses the blowdart animation just like the blunderbuss. But when it shoots, the rifle is reversed (meaning the top part is on the bottom and bottom part is on top, otherwise the muzzle is looking at the correct position).

How can I fix this problem?