Bruce Wayne create the rail gun via Wayne Enterprises Research & Development, for the purpose of being able to penetrate the Batsuit in case it ever fell in the wrong hands. After the rail gun was completed, it was stored inside Wayne Enterprises R&D's main warehouse.
In late 2018, the rail gun was stolen by Tommy Elliot with the intent to to kill Batman. However, his plot was foiled by Batwoman and the rail gun was returned to the warehouse after Tommy's incarceration.
- Projectile weapon: The rail gun is an efficient projectile weapon, powerful enough to kill someone wearing the Batsuit.