The firing animation is mirrored, not rotated (which hand the gun is in depends on which way you're facing).

Yes that is a basegame issue. i tried to add left facing animations but the firing animations mirror the right ones in an attempt to save on Vram. Factorio uses a super duper inefficient sprite system.

Bleh. Is there a bug report on this?

Hi! Caught a bug, when using your modification, the character passes through buildings. I noticed this when playing space exploration and K2. In the vanilla version, everything is fine..