How do I fix accessories, hats, and hair blocking my raycasting gun?

The problem here isn't the raycasting itself; it's because of the fact that your mouse is clicking on the player's accessories. To fix this, use TargetFilter: http://wiki.roblox.com/index.php?title=API:Class/Mouse/TargetFilter

Code:

mouse = Player:GetMouse()
mouse.TargetFilter = Player.Character 

Either this doesn't work, or I put the mouse.TargetFilter = Player.Character in the wrong row.

Script:

Ammo = 45

damage = 8

AbleToFire = true

isFiring = true

Player = game.Players.LocalPlayer
mouse = Player:GetMouse()

script.Parent.Equipped:connect(function(eventMouse)
    Player:WaitForChild("PlayerGui").ScreenGui3.Frame.Visible = true
    eventMouse.Icon = "rbxasset://textures\\GunCursor.png"
    local Arm = Player.Character["Right Arm"]
    local Torso = Arm.Parent.Torso  
local Weld = Player.Character.Torso:WaitForChild("Weld3")
    Weld.Part0 = Torso
    Weld.Part1 = Arm
    Weld.C1 = CFrame.Angles(math.rad(-90), -1, math.rad(0)) * CFrame.new(-1, -0.8, 0.8)

    local Weld2 = Player.Character.Torso:WaitForChild("Weld4")
    local Arm2 = Player.Character["Left Arm"]   
    Weld.Part0 = Torso
    Weld.Part1 = Arm2
    Weld.C1 = CFrame.Angles(math.rad(-90), 1, math.rad(0)) * CFrame.new(-0.3, -0.5, 0.8)
end)

script.Parent.Unequipped:connect(function()
    Player:WaitForChild("PlayerGui").ScreenGui3.Frame.Visible = false
    local Weld = Player.Character.Torso:WaitForChild("Weld3")
    Weld.Part0 = nil
    Weld.Part1 = nil
end)

script.Parent.Activated:connect(function()
isFiring = true
repeat wait(.0600)
    if Ammo > 0 and AbleToFire == true then
script.Parent.FireSound:Play()
local ray = Ray.new(script.Parent.Handle.CFrame.p, (mouse.Hit.p - script.Parent.Handle.CFrame.p).unit * 300)
local part, position = workspace:FindPartOnRay(ray, Player.Character, false, true)
Bullet = Instance.new("Part", workspace)
Bullet.CanCollide = true
Bullet.BrickColor = BrickColor.new("New Yeller")
Bullet.FormFactor = "Custom"
Bullet.Material = "Neon"
Bullet.CanCollide = false
Bullet.Anchored = true
Bullet.Locked = true
Bullet.Name = "M4A1Bullet"

mouse.TargetFilter = Player.Character

local distance = (script.Parent.Handle.CFrame.p - position).magnitude
Bullet.Size = Vector3.new(.0500, .0500, distance)
Bullet.CFrame = CFrame.new(script.Parent.Handle.CFrame.p, position) * CFrame.new(0, 0, -distance / 2)

game:GetService("Debris"):AddItem(Bullet, 0.1)

if part then
    local humanoid = part.Parent:FindFirstChild("Humanoid")

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

if humanoid then
player = game.Players:GetPlayerFromCharacter(part.Parent)   
    if player.TeamColor ~= Player.TeamColor then
    humanoid:TakeDamage(damage)     
    end
        end
end

script.Parent.GripPos = Vector3.new(0.15, -0.4, 0.95)
wait(0)
script.Parent.GripPos = Vector3.new(0.15, -0.4, 1)
Ammo = Ammo - 1
Player.PlayerGui.ScreenGui3.Ammo.Value = Player.PlayerGui.ScreenGui3.Ammo.Value - 1
end
until isFiring == false or Ammo == 0
end)



script.Parent.Deactivated:connect(function()
    isFiring = false
end)

mouse.KeyDown:connect(function(Key)
    if Key == "r" then  
if Ammo <= 44 then
if AbleToFire then
    AbleToFire = false

    AbleToFire = false
script.Parent.ReloadSound:Play()
wait(1.986)
        Ammo = 45
            Player.PlayerGui.ScreenGui3.Ammo.Value = 45
            AbleToFire = true
end
end
end
end)