How to make the pistol this for FPS model not damage players but still damage NPCs?

I've been trying to figure out a way to be able to make the pistol this for FPS Roblox pistol model not to do damage to players, but the script is too long and complicated for me to understand. Please help.

Thank you!

(pistol this for FPS script)

--------------------- TEMPLATE ASSAULT RIFLE WEAPON ---------------------------
-- Waits for the child of the specified parent
local function WaitForChild(parent, childName)
    while not parent:FindFirstChild(childName) do parent.ChildAdded:wait() end
    return parent[childName]
end

----- MAGIC NUMBERS ABOUT THE TOOL -----
-- How much damage a bullet does
local Damage = 50
-- How many times per second the gun can fire
local FireRate = 20 / 30
-- The maximum distance the can can shoot, this value should never go above 1000
local Range = 400
-- In radians the minimum accuracy penalty
local MinSpread = 0.01
-- In radian the maximum accuracy penalty
local MaxSpread = 0.1
-- Number of bullets in a clip
local ClipSize = 12
-- DefaultValue for spare ammo
local SpareAmmo = 100
-- The amount the aim will increase or decrease by
-- decreases this number reduces the speed that recoil takes effect
local AimInaccuracyStepAmount = 0.01
-- Time it takes to reload weapon
local ReloadTime = 2
----------------------------------------

-- Colors
local FriendlyReticleColor = Color3.new(0, 1, 0)
local EnemyReticleColor = Color3.new(1, 0, 0)
local NeutralReticleColor   = Color3.new(1, 1, 1)

local Spread = MinSpread
local AmmoInClip = ClipSize

local Tool = script.Parent
local Handle = WaitForChild(Tool, 'Handle')
local WeaponGui = nil

local LeftButtonDown
local Reloading = false
local IsShooting = false

-- Player specific convenience variables
local MyPlayer = nil
local MyCharacter = nil
local MyHumanoid = nil
local MyTorso = nil
local MyMouse = nil

local RecoilAnim
local RecoilTrack = nil

local IconURL = Tool.TextureId  -- URL to the weapon icon asset

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


local FireSound

local OnFireConnection = nil
local OnReloadConnection = nil

local DecreasedAimLastShot = false
local LastSpreadUpdate = time()

-- this is a dummy object that holds the flash made when the gun is fired
local FlashHolder = nil


local WorldToCellFunction = Workspace.Terrain.WorldToCellPreferSolid
local GetCellFunction = Workspace.Terrain.GetCell

function RayIgnoreCheck(hit, pos)
    if hit then
        if hit.Transparency >= 1 or string.lower(hit.Name) == "water" or
            hit.Name == "Effect" or hit.Name == "Rocket" or hit.Name == "Bullet" or
            hit.Name == "Handle" or hit:IsDescendantOf(MyCharacter) then
            return true
        elseif hit:IsA('Terrain') and pos then
            local cellPos = WorldToCellFunction(Workspace.Terrain, pos)
            if cellPos then
                local cellMat = GetCellFunction(Workspace.Terrain, cellPos.x, cellPos.y, cellPos.z)
                if cellMat and cellMat == Enum.CellMaterial.Water then
                    return true
                end
            end
        end
    end
    return false
end

-- @preconditions: vec should be a unit vector, and 0 < rayLength <= 1000
function RayCast(startPos, vec, rayLength)
    local hitObject, hitPos = game.Workspace:FindPartOnRay(Ray.new(startPos + (vec * .01), vec * rayLength), Handle)
    if hitObject and hitPos then
        local distance = rayLength - (hitPos - startPos).magnitude
        if RayIgnoreCheck(hitObject, hitPos) and distance > 0 then
            -- there is a chance here for potential infinite recursion
            return RayCast(hitPos, vec, distance)
        end
    end
    return hitObject, hitPos
end



function TagHumanoid(humanoid, player)
    -- Add more tags here to customize what tags are available.
    while humanoid:FindFirstChild('creator') do
        humanoid:FindFirstChild('creator'):Destroy()
    end 
    local creatorTag = Instance.new("ObjectValue")
    creatorTag.Value = player
    creatorTag.Name = "creator"
    creatorTag.Parent = humanoid
    DebrisService:AddItem(creatorTag, 1.5)

    local weaponIconTag = Instance.new("StringValue")
    weaponIconTag.Value = IconURL
    weaponIconTag.Name = "icon"
    weaponIconTag.Parent = creatorTag
end

local function CreateFlash()
    if FlashHolder then
        local flash = Instance.new('Fire', FlashHolder)
        flash.Color = Color3.new(1, 140 / 255, 0)
        flash.SecondaryColor = Color3.new(1, 0, 0)
        flash.Size = 0.3
        DebrisService:AddItem(flash, FireRate / 1.5)
    else
        FlashHolder = Instance.new("Part", Tool)
        FlashHolder.Transparency = 1
        FlashHolder.CanCollide= false
        FlashHolder.Size = Vector3.new(1, 1, 1)
        FlashHolder.Position = Tool.Handle.Position
        local Weld = Instance.new("ManualWeld")
        Weld.C0 = CFrame.new(0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1)
        Weld.C1 = CFrame.new(0, 2.2, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0)
        Weld.Part0 = FlashHolder
        Weld.Part1 = Tool.Handle
        Weld.Parent = FlashHolder
    end
end

local function CreateBullet(bulletPos)
    local bullet = Instance.new('Part', Workspace)
    bullet.FormFactor = Enum.FormFactor.Custom
    bullet.Size = Vector3.new(0.1, 0.1, 0.1)
    bullet.BrickColor = MyPlayer.TeamColor
    bullet.Shape = Enum.PartType.Ball
    bullet.CanCollide = false
    bullet.CFrame = CFrame.new(bulletPos)
    bullet.Anchored = true
    bullet.TopSurface = Enum.SurfaceType.Smooth
    bullet.BottomSurface = Enum.SurfaceType.Smooth
    bullet.Name = 'Bullet'
    DebrisService:AddItem(bullet, 2.5)
    local fire = Instance.new("Fire", bullet)
    fire.Color = Color3.new(MyPlayer.TeamColor.r, MyPlayer.TeamColor.g, MyPlayer.TeamColor.b)
    fire.SecondaryColor = Color3.new(MyPlayer.TeamColor.r, MyPlayer.TeamColor.g, MyPlayer.TeamColor.b)
    fire.Size = 5
    fire.Heat = 0
    DebrisService:AddItem(fire, 0.2)
    return bullet
end

local function Reload()
    if not Reloading then
        Reloading = true
        -- Don't reload if you are already full or have no extra ammo
        if AmmoInClip ~= ClipSize and SpareAmmo > 0 then
            if RecoilTrack then
                RecoilTrack:Stop()
            end
            if WeaponGui and WeaponGui:FindFirstChild('Crosshair') then
                if WeaponGui.Crosshair:FindFirstChild('ReloadingLabel') then
                    WeaponGui.Crosshair.ReloadingLabel.Visible = true
                end
            end
            wait(ReloadTime)
            -- Only use as much ammo as you have
            local ammoToUse = math.min(ClipSize - AmmoInClip, SpareAmmo)
            AmmoInClip = AmmoInClip + ammoToUse
            SpareAmmo = SpareAmmo - ammoToUse
            UpdateAmmo(AmmoInClip)
        end
        Reloading = false
    end
end

function OnFire()
    if IsShooting then return end
    if MyHumanoid and MyHumanoid.Health > 0 then
        if RecoilTrack and AmmoInClip > 0 then
            RecoilTrack:Play()
        end
        IsShooting = true
        while LeftButtonDown and AmmoInClip > 0 and not Reloading do
            if Spread and not DecreasedAimLastShot then
                Spread = math.min(MaxSpread, Spread + AimInaccuracyStepAmount)
                UpdateCrosshair(Spread)
            end
            DecreasedAimLastShot = not DecreasedAimLastShot
            if Handle:FindFirstChild('FireSound') then
                Handle.FireSound:Play()
            end
            CreateFlash()
            if MyMouse then
                local targetPoint = MyMouse.Hit.p
                local shootDirection = (targetPoint - Handle.Position).unit
                -- Adjust the shoot direction randomly off by a little bit to account for recoil
                shootDirection = CFrame.Angles((0.5 - math.random()) * 2 * Spread,
                    (0.5 - math.random()) * 2 * Spread,
                    (0.5 - math.random()) * 2 * Spread) * shootDirection
                local hitObject, bulletPos = RayCast(Handle.Position, shootDirection, Range)
                local bullet
                -- Create a bullet here
                if hitObject then
                    bullet = CreateBullet(bulletPos)
                end
                if hitObject and hitObject.Parent then
                    local hitHumanoid = hitObject.Parent:FindFirstChild("Humanoid")
                    if hitHumanoid then
                        local hitPlayer = game.Players:GetPlayerFromCharacter(hitHumanoid.Parent)
                        if MyPlayer.Neutral or (hitPlayer and hitPlayer.TeamColor ~= MyPlayer.TeamColor) then
                            TagHumanoid(hitHumanoid, MyPlayer)
                            hitHumanoid:TakeDamage(Damage)
                            if bullet then
                                bullet:Destroy()
                                bullet = nil
                                --bullet.Transparency = 1
                            end
                            Spawn(UpdateTargetHit)
                        end
                    end
                end

                AmmoInClip = AmmoInClip - 1
                UpdateAmmo(AmmoInClip)
            end
            wait(FireRate)
        end     
        IsShooting = false
        if AmmoInClip == 0 then
            Reload()
        end
        if RecoilTrack then
            RecoilTrack:Stop()
        end
    end
end

local TargetHits = 0
function UpdateTargetHit()
    TargetHits = TargetHits + 1
    if WeaponGui and WeaponGui:FindFirstChild('Crosshair') and WeaponGui.Crosshair:FindFirstChild('TargetHitImage') then
        WeaponGui.Crosshair.TargetHitImage.Visible = true
    end
    wait(0.5)
    TargetHits = TargetHits - 1
    if TargetHits == 0 and WeaponGui and WeaponGui:FindFirstChild('Crosshair') and WeaponGui.Crosshair:FindFirstChild('TargetHitImage') then
        WeaponGui.Crosshair.TargetHitImage.Visible = false
    end
end

function UpdateCrosshair(value, mouse)
    if WeaponGui then
        local absoluteY = 650
        WeaponGui.Crosshair:TweenSize(
            UDim2.new(0, value * absoluteY * 2 + 23, 0, value * absoluteY * 2 + 23),
            Enum.EasingDirection.Out,
            Enum.EasingStyle.Linear,
            0.33)
    end
end

-- Continued