I should warn you that asking a question is not a substitute for doing a search. Your question was answered in about ten minutes, the search took me ten seconds. I just searched “Roblox fastcast” on Google and it was in the top three search results. You’ll get answers a lot faster off of Google than by asking a small handful of volunteers in a region that’s getting ready to sleep. We should be your last resort. That said though, we are of course happy to help. Let me know if you have any questions about this that you can’t answer with a search or by skimming the comments and documentation.
These videos talk a lot about how to get into the usage of rays, fast cast, etc. To sum it up it is basically distance, its used mostly to make weapons, helps physics, etc.
Here’s an open source module if you were curious about looking into the code.
If you are still learning how to make guns, don’t just aim for perfection, experiment more. And you also shouldn’t be using a module you don’t know how works, it may break anytime and you won’t know what to do.
You can give out the solution, but you shouldn’t give out whole sections of working code. You can give code examples and stuff, but we don’t write scripts for people. Don’t sweat it though, you won’t get in trouble even then. We just want to encourage critical thinking and learning and stuff.