Well, the tile is self explanatory. Nothing really to say here.
Once I aim the gun on the left side while my character is turned to the left side and shoot it, the bullets go to the right side instead of the left.
I've tried using the "Set Mirrored" event and some other stuff but it didn't work for some reason.
Here's the image of some of the gun event stuff:
EDIT: I forgot to mention that the gun is aimed with the mouse, and not just the A and D keys.