How would I project the Ray Casting bullet from the gun so it's not a full laser?

I'd like the bullet to be a limited length instead of being a massive line from the gun to the object, but can't figure out how. I'd appreciate some help.

Thanks for your time.

-Species

local tool = script.Parent
local player = game:GetService("Players").LocalPlayer

tool.Equipped:connect(function(mouse)
	print("Tool Equipped")

	local debounce = false
	
	mouse.Button1Down:connect(function(hit)
		if not debounce then
			debounce = true
			print("Mouse pressed!")
			local ray = Ray.new(tool.BulletExit.CFrame.p,(mouse.Hit.p - tool.BulletExit.CFrame.p).unit * 300)
			local part, position = workspace:FindPartOnRay(ray, player.Character, false, true)
		
			local beam = Instance.new("Part", workspace)
			beam.BrickColor = BrickColor.new("Really black")
			beam.FormFactor = "Custom"
			beam.Material = "Neon"
			beam.Transparency = 0.25
			beam.Anchored = true
			beam.Locked = true
			beam.CanCollide = false
		
			local distance = (tool.BulletExit.CFrame.p - position).magnitude
			beam.Size = Vector3.new(0.3, 0.3, distance)
			beam.CFrame = CFrame.new(tool.BulletExit.CFrame.p, position) * CFrame.new(0, 0, -distance / 2)
		
			game:GetService("Debris"):AddItem(beam, 0.1)
			wait(.3)
			debounce = false

			if part then
				local humanoid = part.Parent:FindFirstChild("Humanoid")
			
				if not humanoid then
					humanoid = part.Parent.Parent:FindFirstChild("Humanoid")
				
				end
			
				if humanoid then
					humanoid:TakeDamage(15)
				end
			end
		end
	end)
end)

You will need to use a recursive ray cast.

You can take the distance from the muzzle of the gun and divide it by the number of raycasts per shot to find the length of each ray cast.

function RecursiveRaycast(Gun, Mouse, NumofRays) -- Gun: The muzzle, Mouse: The position of the mouse.
	LastPos = Gun
	for i = 1, NumofRays do
		local RRay = Ray.New(
			LastPos,
			Vector3.new(0, 0, LastPos.Z + Mouse.Hit.p.Z/NumofRays)
		)
		local Hit, Pos = workspace:FindPartOnRay(RRay, Character)
		if Hit then
			break -- Hit object stop raycast
			-- Check for human
		else
			LastPos = Pos
		end
	end
end

That's the basic concept. I haven't dealt with recursive raycasting for a very long time so chances are you're going to need to fix and modify some things. I wrote this in the browser so syntax errors are a great possibility.