Improperly handled bullet casings can affect performance or safety. Learn common errors and how to avoid them. Click to read ...

Utah Gov. Spencer Cox said investigators found four inscribed "bullet casings" and a rifle in an area the shooter ran through.

Bullet casings from the gun suspected of being used to assassinate Charlie Kirk were engraved with messages officials believe hint at a possible motive to the killing.

Tyler Robinson left obscure messages on bullet casings, authorities say, but they have yet to discover a clear motive.