The casing does not leave a firearm with the projectile. They separate and the casing is ejected after the round is fired. The casing will have a neck, then the shoulder steps up to the wall, which continues straight to the head and finally the rim of the cartridge, which prevents the casing from following the projectile. My credentials? The job that I had in the US Navy was Gunner's Mate. 

The writer won't use the word "rifle" because it might scare someone. Let's not use the words "plastic bag" because someone might be offended by the possibility of asphyxiation and the destruction of the entire planet by just saying them. Let's not say "water" because saying it might make someone feel like they would drown or dehydrate. We also shouldn't say "Eternum" because someone might be reminded of their own mortality. And once you start down that path, eventually there will be no word that is considered "safe."

The Skyrim Blackreach background music is being used in Eternum. Does Caribdis have permission? 

Dalia's loser "L" sign that she makes after the arena fight is backwards. It is made with the right hand, not the left.