I've managed to extract the files for impact sounds for brass shells as well as shot shells, as well as the .nif for the holorifle's casing mf cell. Unfortunately, I'm still coming up short in how to actually tell the GECK to use a different sound, the only entry even mentioning casings in it is under art and sound for what casing model to use. If what audio file it uses is linked to the texture file, I don't even know what program to use. It's funny, the base grenade launcher has shotshell sounds for ejected shells, but not the holorifle. Managed to get it working by changing the entry PHYCasingRifle to use the folder of shotgun SFX, but that's not acceptable, as that changes all weapons that use the rifle casing sound to shotgun as well. What I'm having trouble with at this point is actually finding any entry, anywhere, that actually shows the PHY selection of casing impact sounds actually assigned to any weapon, let alone the one I'm trying to work with. I can't reassign what sound a weapon uses uses if I can't find where the weapon has been assigned the sound effect in the first place. Any ideas?