during the final moments of the public 0.2, you can see as the sniper rifle fires the bullets have the casing attached. may be worth fixing
also eva best girl.
idriel scene potentially?
An idea I had so that I can keep my suspension of disbelief is that was actually a rail from a railgun.
The flash can also be explained as it being a hybrid conventional/railgun propulsion, where it's initially accelerated like a normal bullet through burning gunpowder, and then the electromagnetic propulsion gives it a boost.
Reason for doing it that way; longer lifespan of the rails, lower energy requirements for the electromagnetic propulsion. In case you feel like explaining it even further if you go with my idea.