RailAmmo is a different kind of Railgun; It allows you to use rails as ammo in any machine gun. The rails can be collected after hitting their target, and be crafted back into ammo or placed as normal. Unspent ammo can also be reverted back to normal rails. I made this mod as a joke for April Fool's Day, 2022, and was encouraged to upload it by someone who commented on said joke.

Here's the original joke GIF/the original prototype in action: https://steamcommunity.com/sharedfiles/filedetails/?id=2787968766

Notes:
-- To use rails as ammo, you must research Rails as Ammo, and then craft rails into their ammo form
-- Using rails as ammo is very messy, so it is recommended to have construction bots
-- https://mods.factorio.com/mod/recursive-blueprints may be useful for automating cleanup at long-term defense sites