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!