How do I add back Shell Casings for my weapon Mod? What controls that? And why doesn't my mod weapon have any ejecting?

[alphabeta997]

My new modded weapon doesn't appear to be ejecting shell casings. WHY? can someone with more knowledge over this please explain what controls that? And why it's not?

I am using the default animations from the Handmade Rifle, in FO4, which does eject casings from the left side, towards the player, but my weapon, which I just duplicated and used the Handmade rifle as a template for in the Creation Kit, doesn't have any shells ejecting from the side.

I also used BSA archive to extract the Handmadegun.nif file, which instead of being seperate parts, for each weapon mod, like standard protocol for weapon setup in Fallout 4, it was just one .nif file with everything on it, and thus I followed that, putting everything on one .nif file.

Could someone please tell me how I can add back shell casings that will eject from the weapon? Thanks.