Gun faces camera?

My Friend asked me to fix he's gun. I fixed most of it however the ADS seems to work, wrong. The code works as expected however when the user ADS and looks up the gun looks awful. Here is what it looks like http://i.gyazo.com/008fda010fd5d4c2542653fb3ba9fcd3.mp4

-- Variables for services
local render = game:GetService("RunService").RenderStepped
local contextActionService = game:GetService("ContextActionService")
local userInputService = game:GetService("UserInputService")
local hud = nil  local equiped = false
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local Tool = script.Parent
local UID = script.Parent.Configurations.UID.Value or "NoID"
local lmbDown = false
-- Variables for Module Scripts
local screenSpace = require(Tool:WaitForChild("ScreenSpace"))

local connection
-- Variables for character joints

local neck, shoulder, oldNeckC0, oldShoulderC0 

local mobileShouldTrack = true

local function amISitting(character)
    local t = character.Torso
    for _, part in pairs(t:GetConnectedParts(true)) do
        if part:IsA("Seat") or part:IsA("VehicleSeat") then
            return true
        end
    end
end


local function frame(mousePosition)
    if not mobileShouldTrack then return end
    if player.Character.Humanoid:GetState() ~= Enum.HumanoidStateType.Swimming then
        local torso = player.Character.Torso
        local head = player.Character.Head

        local toMouse = (mousePosition - head.Position).unit
        local angle = math.acos(toMouse:Dot(Vector3.new(0,1,0)))
        local arm = player.Character:FindFirstChild("Right Arm")
        local fromArmPos = torso.Position + torso.CFrame:vectorToWorldSpace(Vector3.new(
            torso.Size.X/2 + arm.Size.X/2, torso.Size.Y/2 - arm.Size.Z/2, 0))
        local toMouseArm = ((mousePosition - fromArmPos) * Vector3.new(1,0,1)).unit
        local look = (torso.CFrame.lookVector * Vector3.new(1,0,1)).unit


        local lateralAngle = 0


        shoulder.C0 = CFrame.new(1,0.5,0) * CFrame.Angles(math.pi/2 - angle,math.pi/2 + lateralAngle,0) 


        if not amISitting(player.Character) then
            torso.CFrame = CFrame.new(torso.Position, torso.Position + (Vector3.new(
                mousePosition.X, torso.Position.Y, mousePosition.Z)-torso.Position).unit)
        else

        end 
    end
end

local function pcFrame()
    frame(mouse.Hit.p)
end

local function mobileFrame(touch, processed)
    if not processed then
        local test = screenSpace.ScreenToWorld(touch.Position.X, touch.Position.Y, 1)
        local nearPos = game.Workspace.CurrentCamera.CoordinateFrame:vectorToWorldSpace(screenSpace.ScreenToWorld(touch.Position.X, touch.Position.Y, 1))
        nearPos = game.Workspace.CurrentCamera.CoordinateFrame.p - nearPos
        local farPos = screenSpace.ScreenToWorld(touch.Position.X, touch.Position.Y,50) 
        farPos = game.Workspace.CurrentCamera.CoordinateFrame:vectorToWorldSpace(farPos) * -1
        if farPos.magnitude > 900 then
            farPos = farPos.unit * 900
        end
        local ray = Ray.new(nearPos, farPos)
        local part, pos = game.Workspace:FindPartOnRay(ray, player.Character)
        if pos then
            frame(pos)
        end
    end
end

local oldIcon = nil
local zoombreak = false
local function removeAim()
        zoombreak = true
    workspace.CurrentCamera.FieldOfView = 70
        script.Parent.Grip =CFrame.new(0.0100012077, -0.307948351, 0, 0.99973309, -0.0231027305, 0, 0.0231027305, 0.99973309, 0, 0, 0, 1)
    wait(0.2)
    zoombreak = false end



local function equip()
    local torso = script.Parent.Parent.Torso
        neck = torso.Neck   
    oldNeckC0 = neck.C0
    shoulder = torso:FindFirstChild("Right Shoulder")
    oldShoulderC0 = shoulder.C0


    local torso = player.Character.Torso

    -- Setup joint variables


    mouse.Button2Down:connect(function ()       if script.Parent.Parent:FindFirstChild("Humanoid")==nil then else 
    for i = 70,50,-2 do

        if zoombreak then zoombreak = false break end
    workspace.CurrentCamera.FieldOfView = i
    script.Parent.Grip = CFrame.new(1.51346564, -0.307948351, 0, 0.99973309, -0.0231027305, 0, 0.0231027305, 0.99973309, 0, 0, 0, 1)
    wait()
    end end
end)

mouse.Button2Up:connect(function () if script.Parent.Parent:FindFirstChild("Humanoid")==nil then else 
removeAim()
end


end)



    oldIcon = mouse.Icon
    mouse.Icon = "http://www.roblox.com/asset/?id=79658449"


    if userInputService.TouchEnabled then
        connection = userInputService.TouchMoved:connect(mobileFrame)
    else
        connection = render:connect(pcFrame)
    end

    userInputService.TouchStarted:connect(function(touch, processed)
        mobileShouldTrack = not processed
    end)    
    userInputService.TouchEnded:connect(function(touch, processed)
        mobileShouldTrack = false
    end)


    game.ReplicatedStorage["ROBLOX_"..UID.."EquipEvent"]:FireServer()



    local function autoFire() 
        while lmbDown do
            wait()
        game.ReplicatedStorage["ROBLOX_"..UID.."FireEvent"]:FireServer(mouse.Hit.p)

end 
    end

    mouse.Button1Down:connect(function()
    lmbDown = true
    autoFire()
    end)
        mouse.Button1Up:connect(function()
    lmbDown = false

    end)
    local function updateAmmoFromReload()
            wait(script.Parent.Configurations.ReloadTime.Value)



end
    -- Bind reload event to mobile button and r key
    contextActionService:BindActionToInputTypes("Reload", function() 
        game.ReplicatedStorage["ROBLOX_"..UID.."ReloadEvent"]:FireServer()  


        coroutine.resume(coroutine.create(updateAmmoFromReload)) 
    end, true, "r")


end

-- Function to bind to Unequip event
local function unequip() removeAim() equiped = false
    if connection then connection:disconnect() end
    contextActionService:UnbindAction("Reload")
    game.ReplicatedStorage["ROBLOX_"..UID.."UnequipEvent"]:FireServer()
    mouse.Icon = oldIcon


end


-- Bind tool events
Tool.Equipped:connect(equip)
Tool.Unequipped:connect(unequip)

Any Advice on how to point the ADS towards the camera?

This script is in a localscript on a fliteringEnabled Game. (Other users should not see ADS)