Lazer Gun script

if game:GetService("RunService"):IsClient() then error("Script must be server-side in order to work; use h/ and not hl/") end
local Player,game,owner = owner,game
local RealPlayer = Player
do
    print("FE Compatibility code by Mokiros")
    local rp = RealPlayer
    script.Parent = rp.Character

    --RemoteEvent for communicating
    local Event = Instance.new("RemoteEvent")
    Event.Name = "UserInput_Event"

    --Fake event to make stuff like Mouse.KeyDown work
    local function fakeEvent()
        local t = {_fakeEvent=true,Functions={},Connect=function(self,f)table.insert(self.Functions,f) end}
        t.connect = t.Connect
        return t
    end

    --Creating fake input objects with fake variables
    local m = {Target=nil,Hit=CFrame.new(),KeyUp=fakeEvent(),KeyDown=fakeEvent(),Button1Up=fakeEvent(),Button1Down=fakeEvent()}
    local UIS = {InputBegan=fakeEvent(),InputEnded=fakeEvent()}
    local CAS = {Actions={},BindAction=function(self,name,fun,touch,...)
        CAS.Actions[name] = fun and {Name=name,Function=fun,Keys={...}} or nil
    end}
    --Merged 2 functions into one by checking amount of arguments
    CAS.UnbindAction = CAS.BindAction

    --This function will trigger the events that have been :Connect()'ed
    local function te(self,ev,...)
        local t = m[ev]
        if t and t._fakeEvent then
            for _,f in pairs(t.Functions) do
                f(...)
            end
        end
    end
    m.TrigEvent = te
    UIS.TrigEvent = te

    Event.OnServerEvent:Connect(function(plr,io)
        if plr~=rp then return end
        m.Target = io.Target
        m.Hit = io.Hit
        if not io.isMouse then
            local b = io.UserInputState == Enum.UserInputState.Begin
            if io.UserInputType == Enum.UserInputType.MouseButton1 then
                return m:TrigEvent(b and "Button1Down" or "Button1Up")
            end
            for _,t in pairs(CAS.Actions) do
                for _,k in pairs(t.Keys) do
                    if k==io.KeyCode then
                        t.Function(t.Name,io.UserInputState,io)
                    end
                end
            end
            m:TrigEvent(b and "KeyDown" or "KeyUp",io.KeyCode.Name:lower())
            UIS:TrigEvent(b and "InputBegan" or "InputEnded",io,false)
        end
    end)
    Event.Parent = NLS([==[
    local Player = game:GetService("Players").LocalPlayer
    local Event = script:WaitForChild("UserInput_Event")

    local Mouse = Player:GetMouse()
    local UIS = game:GetService("UserInputService")
    local input = function(io,a)
        if a then return end
        --Since InputObject is a client-side instance, we create and pass table instead
        Event:FireServer({KeyCode=io.KeyCode,UserInputType=io.UserInputType,UserInputState=io.UserInputState,Hit=Mouse.Hit,Target=Mouse.Target})
    end
    UIS.InputBegan:Connect(input)
    UIS.InputEnded:Connect(input)

    local h,t
    --Give the server mouse data 30 times every second, but only if the values changed
    --If player is not moving their mouse, client won't fire events
    while wait(1/30) do
        if h~=Mouse.Hit or t~=Mouse.Target then
            h,t=Mouse.Hit,Mouse.Target
            Event:FireServer({isMouse=true,Target=t,Hit=h})
        end
    end]==],Player.Character)

    ----Sandboxed game object that allows the usage of client-side methods and services
    --Real game object
    local _rg = game

    --Metatable for fake service
    local fsmt = {
        __index = function(self,k)
            local s = rawget(self,"_RealService")
            if s then return s[k] end
        end,
        __newindex = function(self,k,v)
            local s = rawget(self,"_RealService")
            if s then s[k]=v end
        end,
        __call = function(self,...)
            local s = rawget(self,"_RealService")
            if s then return s(...) end
        end
    }
    local function FakeService(t,RealService)
        t._RealService = typeof(RealService)=="string" and _rg:GetService(RealService) or RealService
        return setmetatable(t,fsmt)
    end

    --Fake game object
    local g = {
        GetService = function(self,s)
            return self[s]
        end,
        Players = FakeService({
            LocalPlayer = FakeService({GetMouse=function(self)return m end},Player)
        },"Players"),
        UserInputService = FakeService(UIS,"UserInputService"),
        ContextActionService = FakeService(CAS,"ContextActionService"),
    }
    rawset(g.Players,"localPlayer",g.Players.LocalPlayer)
    g.service = g.GetService

    g.RunService = FakeService({
        RenderStepped = _rg:GetService("RunService").Heartbeat,
        BindToRenderStep = function(self,name,_,fun)
            self._btrs[name] = self.Heartbeat:Connect(fun)
        end,
        UnbindFromRenderStep = function(self,name)
            self._btrs[name]:Disconnect()
        end,
    },"RunService")

    setmetatable(g,{
        __index=function(self,s)
            return _rg:GetService(s) or typeof(_rg[s])=="function"
            and function(_,...)return _rg[s](_rg,...)end or _rg[s]
        end,
        __newindex = fsmt.__newindex,
        __call = fsmt.__call
    })
    --Changing owner to fake player object to support owner:GetMouse()
    game,owner = g,g.Players.LocalPlayer
end
local p = game.Players.LocalPlayer
local lol = Instance.new("Tool",p.Backpack)
lol.Name = "LaserGun"
lol.TextureId = "http://www.roblox.com/asset?id=130093050"
local lol2 = Instance.new("Part",lol)
lol2.Name = "Handle"
local lol3 = Instance.new("SpecialMesh",lol2)
lol3.MeshId = "http://www.roblox.com/asset?id=130099641"
lol3.Scale = Vector3.new(0.65, 0.65, 0.65)
lol3.TextureId = "http://www.roblox.com/asset?id=130093033"
local lol4 = Instance.new("PointLight",lol2)
lol4.Color = Color3.new(0, 255, 255)
lol4.Range = 6
local lol5 = Instance.new("Sound",lol2)
lol5.Name = "Fire"
lol5.SoundId = "http://www.roblox.com/asset?id=130113322"
lol6 = Instance.new("Sound",lol2)
lol6.Name = "Reload"
lol6.SoundId = "http://www.roblox.com/asset?id=130113370"
local lol7 = Instance.new("Sound",lol2)
lol7.Name = "HitFade"
lol7.SoundId = "http://www.roblox.com/asset?id=130113415"
-----------------
--| Constants |--
-----------------

local SHOT_SPEED = 100
local SHOT_TIME = 1

local NOZZLE_OFFSET = Vector3.new(0, 0.4, -1.1)

-----------------
--| Variables |--
-----------------

local PlayersService = Game:GetService('Players')
local DebrisService = Game:GetService('Debris')

local Tool = lol
local Handle = Tool:WaitForChild('Handle')

local FireSound = Handle:WaitForChild('Fire')
local ReloadSound = Handle:WaitForChild('Reload')
local HitFadeSound = Handle:WaitForChild('HitFade')

local PointLight = Handle:WaitForChild('PointLight')

local Character = nil
local Humanoid = nil
local Player = nil

local BaseShot = nil

-----------------
--| Functions |--
-----------------

-- Returns a character ancestor and its Humanoid, or nil
local function FindCharacterAncestor(subject)
    if subject and subject ~= Workspace then
        local humanoid = subject:FindFirstChild('Humanoid')
        if humanoid then
            return subject, humanoid
        else
            return FindCharacterAncestor(subject.Parent)
        end
    end
    return nil
end

-- Removes any old creator tags and applies new ones to the specified target
local function ApplyTags(target)
    while target:FindFirstChild('creator') do
        target.creator:Destroy()
    end

    local creatorTag = Instance.new('ObjectValue')
    creatorTag.Value = Player
    creatorTag.Name = 'creator' --NOTE: Must be called 'creator' for website stats

    local iconTag = Instance.new('StringValue')
    iconTag.Value = Tool.TextureId
    iconTag.Name = 'icon'

    iconTag.Parent = creatorTag
    creatorTag.Parent = target
    DebrisService:AddItem(creatorTag, 4)
end

-- Returns all objects under instance with Transparency
local function GetTransparentsRecursive(instance, partsTable)
    local partsTable = partsTable or {}
    for _, child in pairs(instance:GetChildren()) do
        if child:IsA('BasePart') or child:IsA('Decal') then
            table.insert(partsTable, child)
        end
        GetTransparentsRecursive(child, partsTable)
    end
    return partsTable
end

local function SelectionBoxify(instance)
    local selectionBox = Instance.new('SelectionBox')
    selectionBox.Adornee = instance
    selectionBox.Color = BrickColor.new('Toothpaste')
    selectionBox.Parent = instance
    return selectionBox
end

local function Light(instance)
    local light = PointLight:Clone()
    light.Range = light.Range + 2
    light.Parent = instance
end

local function FadeOutObjects(objectsWithTransparency, fadeIncrement)
    repeat
        local lastObject = nil
        for _, object in pairs(objectsWithTransparency) do
            object.Transparency = object.Transparency + fadeIncrement
            lastObject = object
        end
        wait()
    until lastObject.Transparency >= 1 or not lastObject
end

local function Dematerialize(character, humanoid, firstPart)
    humanoid.WalkSpeed = 0

    local parts = {}
    for _, child in pairs(character:GetChildren()) do
        if child:IsA('BasePart') then
            child.Anchored = true
            table.insert(parts, child)
        elseif child:IsA('LocalScript') or child:IsA('Script') then
            child:Destroy()
        end
    end

    local selectionBoxes = {}

    local firstSelectionBox = SelectionBoxify(firstPart)
    Light(firstPart)
    wait(0.05)

    for _, part in pairs(parts) do
        if part ~= firstPart then
            table.insert(selectionBoxes, SelectionBoxify(part))
            Light(part)
        end
    end

    local objectsWithTransparency = GetTransparentsRecursive(character)
    FadeOutObjects(objectsWithTransparency, 0.1)

    wait(0.5)

    humanoid.Health = 0
    DebrisService:AddItem(character, 2)

    local fadeIncrement = 0.05
    Delay(0.2, function()
        FadeOutObjects({firstSelectionBox}, fadeIncrement)
        if character then
            character:Destroy()
        end
    end)
    FadeOutObjects(selectionBoxes, fadeIncrement)
end

local function OnTouched(shot, otherPart)
    local character, humanoid = FindCharacterAncestor(otherPart)
    if character and humanoid and character ~= Character then
        ApplyTags(humanoid)
        if shot then
            local hitFadeSound = shot:FindFirstChild(HitFadeSound.Name)
            if hitFadeSound then
                hitFadeSound.Parent = humanoid.Torso
                hitFadeSound:Play()
            end
            shot:Destroy()
        end
        Dematerialize(character, humanoid, otherPart)
    end
end

local function OnEquipped()
    Character = Tool.Parent
    Humanoid = Character:WaitForChild('Humanoid')
    Player = PlayersService:GetPlayerFromCharacter(Character)
end

local function OnActivated()
    if Tool.Enabled and Humanoid.Health > 0 then
        Tool.Enabled = false

        FireSound:Play()

        local handleCFrame = Handle.CFrame
        local firingPoint = handleCFrame.p + handleCFrame:vectorToWorldSpace(NOZZLE_OFFSET)
        local shotCFrame = CFrame.new(firingPoint, Humanoid.TargetPoint)

        local laserShotClone = BaseShot:Clone()
        laserShotClone.CFrame = shotCFrame + (shotCFrame.lookVector * (BaseShot.Size.Z / 2))
        local bodyVelocity = Instance.new('BodyVelocity')
        bodyVelocity.velocity = shotCFrame.lookVector * SHOT_SPEED
        bodyVelocity.Parent = laserShotClone
        laserShotClone.Touched:connect(function(otherPart)
            OnTouched(laserShotClone, otherPart)
        end)
        DebrisService:AddItem(laserShotClone, SHOT_TIME)
        laserShotClone.Parent = Tool

        wait(0.6) -- FireSound length

        ReloadSound:Play()
        wait(0.75) -- ReloadSound length

        Tool.Enabled = true
    end
end

local function OnUnequipped()

end

--------------------
--| Script Logic |--
--------------------

BaseShot = Instance.new('Part')
BaseShot.Name = 'Effect'
BaseShot.FormFactor = Enum.FormFactor.Custom
BaseShot.Size = Vector3.new(0.2, 0.2, 3)
BaseShot.CanCollide = false
BaseShot.BrickColor = BrickColor.new('Toothpaste')
SelectionBoxify(BaseShot)
Light(BaseShot)
HitFadeSound:Clone().Parent = BaseShot

Tool.Equipped:connect(OnEquipped)
Tool.Unequipped:connect(OnUnequipped)
Tool.Activated:connect(OnActivated)