Ray guns firing from all people?

Here's the problem. The server script is being replicated across all clients and responds to that remote event. So, when one client fires the server, all the clients receive that event. Therefore, all clients are creating the laser from their gun. And here's a solution:

You could add the player as a parameter, and only fire the laser from their gun. It would work something like this.

Local Script

script.Parent.Activated:Connect(function()
	local mouse = game.Players.LocalPlayer:GetMouse()
	game.ReplicatedStorage.BulletHandler:FireServer(mouse.Hit.p, game.Players.LocalPlayer)
end)

Server Script

debounce = false

game.ReplicatedStorage.BulletHandler.OnServerEvent:Connect(function(plr, mousePos)
	if plr == game.Players:GetPlayerFromCharacter(script.Parent.Parent) then
		
		if debounce == false then
		
		debounce = true
		
		local beam = Instance.new("Part",game.Workspace)
		beam.Material = "Neon"
		--color Changes based on name
		if script.Parent.Name == "RedGun" then
			beam.BrickColor = BrickColor.Red()
		elseif script.Parent.Name == "BluGun" then
			beam.BrickColor = BrickColor.Blue()
		end
		-- will change to have color based on team
		beam.Anchored = true
		beam.CanCollide = false
		
		local ray = Ray.new(script.Parent.Part.Position , (mousePos - script.Parent.Handle.Position).unit * 300)
		local obj, endpoint = workspace:FindPartOnRay(ray, script.Parent.Parent)
		
		local distance = (script.Parent.Handle.Position - endpoint).magnitude
		beam.Size = Vector3.new(1,1, distance)
		beam.CFrame = CFrame.new(script.Parent.Handle.Position, endpoint) * CFrame.new(0,0, -distance / 2)
			
		if obj then 
			local humanoid = obj.Parent:FindFirstChild("Humanoid")
			if humanoid then
				humanoid:TakeDamage(20)
			end
		end
		
		game:GetService("Debris"):AddItem(beam, .2)
		
		wait(.5)
		debounce = false
		
		end
	end
end)