Gun script functioning improperly.Help?

I am making a gun and basically when I equip the tool it doesn't play the holding animation. when I unequip the gun, all the functions from the gun still work, for example, the aiming. function. Here is the script:

--Variables
local cam = game.Workspace.CurrentCamera
local mouse = game.Players.LocalPlayer:GetMouse()
local ts = game:GetService("TweenService")
--animations
local equipanim = script:WaitForChild("equip")
local equiptrack = game.Players.LocalPlayer.Character:WaitForChild("Humanoid"):LoadAnimation(equipanim)

local aimanim = script:WaitForChild("aim")
local aimtrack = game.Players.LocalPlayer.Character:WaitForChild("Humanoid"):LoadAnimation(aimanim)
--events
script.Parent.Equipped:Connect(function()
   equiptrack:Play()
   mouse.Button2Down:Connect(function()
    equiptrack:Stop()
    game.Players.LocalPlayer.Character:WaitForChild("Humanoid").WalkSpeed = 10
    mouse.Icon = "http://www.roblox.com/asset?id=1871997087"
    local ti = TweenInfo.new(.1,Enum.EasingStyle.Linear,Enum.EasingDirection.Out)
    local tablething = {
        FieldOfView = 40
    }
    local tween = ts:Create(cam,ti,tablething)
    tween:Play()
    aimtrack:Play()
  end)
   mouse.Button2Up:Connect(function()
    aimtrack:Stop()
    equiptrack:Play()
    game.Players.LocalPlayer.Character:WaitForChild("Humanoid").WalkSpeed = 16
    mouse.Icon = ""
    local ti = TweenInfo.new(.1,Enum.EasingStyle.Linear,Enum.EasingDirection.Out)
    local tablething = {
        FieldOfView = 70
    }
    local tween = ts:Create(cam,ti,tablething)
    tween:Play()
  end)
end)
script.Parent.Unequipped:Connect(function()
    equiptrack:Stop()
    aimtrack:Stop()
end)