Example: A poorly coded admin script listens for "GiveTool" remote with a tool ID. The exploiter fires remote:FireServer("GiveTool", "LaserGun123") . The server, trusting the client, hands over the gun.
The only completely safe, legal, and reliable way to get a custom weapon like a laser gun is to create it yourself or use legitimate free models within , the official game development environment Roblox provides for free.