Problem with raycasting spread?

So I recently picked up raycasting and started to experiment with it. Everything works fine without two things, number one I can't see the ray part. Number two, after I did my best to implement a spread system the gun broke down, it doesn't hit anything. So I added a print(hit) which always returns nil when I got the spread system.

Edit: forgot to add the spread part before, it's fixed now though

--Gun

local tool = script.Parent
local player = game:GetService("Players").LocalPlayer
local character = player.Character or player.CharacterAdded:wait()
local human = character:WaitForChild("Humanoid")
local handle = tool.Handle
local mouse = player:GetMouse()

local clip = 30
local ammo = 90
local equipped = nil
local reloading = false
local damage = 10
local IsFiring = nil

local spreadX = 0
local spreadY = 0
local spreadZ = 0
local spreadXMax = 1.1
local spreadYMax = 0.3
local spreadZMax = 1.1

local damageModifier = {
1.5,
1,
0.7,
0.5
}
print(tonumber(damageModifier[1]))

local lastfire = 0
local rps = 0
local shootwindow = 0.5

tool.Equipped:connect(function() -- shooting
	equipped = true
	mouse.Button1Down:connect(function()
		if clip >= 1 and reloading == false then
			print("firedonce")
			repeat
				print("fires")
				
				local clickdelta = tick() -lastfire -- spread
				if clickdelta > 1 then
					lastfire = tick()	
					if clickdelta < shootwindow then
						rps = rps + 1
						if rps >= 4 then
							spreadX = spreadX + 0.0423
							spreadZ = spreadZ + 0.0423
							spreadY = spreadY + 0.0115
							if spreadX > spreadXMax then
								spreadX = spreadXMax
								return
							end
							if spreadY > spreadYMax then
								spreadY = spreadYMax
								return
							end
							if spreadZ > spreadZMax then
								spreadZ = spreadZMax
								return
							end
						end
					end
				end
				
				local ray = Ray.new(
					handle.CFrame.p, --origin
					(mouse.hit.p - handle.CFrame.p).unit  + Vector3.new(math.random(0,spreadX),math.random(0,spreadY),math.random(0,spreadZ))* 500 --direction
				)
				local hit, position = workspace:FindPartOnRay(ray, character,nil)
					
				local bullet = Instance.new("Part", workspace) --Part
					
				bullet.BrickColor = BrickColor.new("Yellow")
				bullet.FormFactor = "Custom"
				bullet.Material = "Neon"
				bullet.Transparency = 0.25
				bullet.Locked = true
				bullet.Anchored = true
				bullet.CanCollide = false
			
			
				local distance = (handle.CFrame.p - position).magnitude
				bullet.Size = Vector3.new(0.3,0.3,distance)
				bullet.CFrame = CFrame.new(handle.CFrame.p,position) * CFrame.new(0,0, -distance / 2)
				
				game:GetService("Debris"):AddItem(bullet,1)
				
				clip = clip - 1
				print(clip)
				IsFiring = true
				print(hit.Name)
				if hit and hit ~= nil then
					print(hit.Name)
					if hit.Parent:FindFirstChild("Humanoid") and hit.Parent.Name == "Zombie" then --Damage
						local humanoid = hit.Parent:FindFirstChild("Humanoid")
						if humanoid and humanoid.Health > 0 then
							if hit.Name == "Head" then
								humanoid:TakeDamage(damage * tonumber(damageModifier[1]))
							elseif hit.Name == "Torso" then
								humanoid:TakeDamage(damage * tonumber(damageModifier[2]))
							elseif hit.Name == "Right Arm" or hit.Name == "Left Arm" then
								humanoid:TakeDamage(damage * tonumber(damageModifier[3]))
							elseif hit.Name == "Right Leg" or hit.Name == "Left Leg" then
								humanoid:TakeDamage(damage * tonumber(damageModifier[4 ]))
							end
						end
					end
				end 
			wait(0.115)
			until clip <= 0 or IsFiring == false
		end
	end)
	
	mouse.Button1Up:connect(function() --stop shooting
		IsFiring = false
	end)
	
	mouse.KeyDown:connect(function(key) --reload
		key:lower()
		if key == "r" and reloading == false and equipped == true and clip <= 29 and ammo >= 1 then
			for i = 1,30 do
				wait()
				if clip <= 29 and ammo >= 1 then
					clip = clip + 1
					ammo = ammo - 1
					print(clip)
					print(ammo)
				else
					break
				end
			end
		end
	end)
	
end)	

tool.Unequipped:connect(function()
	equipped = false
end)

Thanks in advance, Kryddan!