Raycast Off-Set

Forgive me for posting this - But I’m trying to figure out how to create a “Projectile” using a mesh’s offset that travels from one side of the Ray’s beam to another. I’m fairly certain I’ve seen a post about this in the past but I can’t seem to locate it.

This is the code I’m attempting to edit - It’s the simple ROBLOX Raycast Demo. None of my attempts seem to work.

local ray = Ray.new(System.Exterior.Root.CFrame.p, (TargetPos - System.Exterior.Root.CFrame.p).unit * 300)
		local part, position = workspace:FindPartOnRay(ray, System.Exterior, false, true)
	local beam = Instance.new("Part", workspace)
	beam.BrickColor = BrickColor.new("Bright red")
	beam.FormFactor = "Custom"
	beam.Material = "Neon"
	beam.Transparency = 0.25
	beam.Anchored = true
	beam.Locked = true
	beam.CanCollide = false
	local distance = (System.Exterior.Root.CFrame.p - position).magnitude
	beam.Size = Vector3.new(0.3, 0.3, distance)
	beam.CFrame = CFrame.new(System.Exterior.Root.CFrame.p, position) * CFrame.new(0, 0, -distance / 2)
	game:GetService("Debris"):AddItem(beam, 0.1)

I’m seeing an object being called System.Exterior in your code. What exactly is it?