When MCD weapons are holstered using BackSlot the weapons appear massive on the character and off-center. Other modded tools and weapons do not have this issue.

Oh dear, you're not kidding! I'm looking into this. I wonder what information it is looking for that makes them look so big? I think I know why some of them of off centre, though, so I can fix that pretty easily.

I've reached out to Globox_Z and we're working on getting this solved

Globox_Z and I were able to resolve all of the render issues! :D