How can I add Friendly Fire to my guns?

I'll oversimplify this. Alright so I have a local script which handles most of everything that includes shooting it. Although I'm having trouble adding friendly fire. does anybody know how to do it?

--Roblox Services--
local Players = game.Players

--//Variables\\--
local tool = script.Parent.Parent
local player = game:GetService("Players").LocalPlayer
local mouse = player:GetMouse()
local hole = tool:WaitForChild("Hole")
local handle = tool:WaitForChild("Handle")
local actionService = game:GetService("ContextActionService")
local mouseDown = false
local equipped = false
local Configurations = tool.Configurations

--//Folders\\--
local animations = tool:WaitForChild("Animations")
local configs = tool:WaitForChild("Configurations")
local remotes = tool:WaitForChild("Remotes")
local bindables = tool:WaitForChild("Bindables")

--//Animations\\--
local recoilAnim = animations:WaitForChild("Recoil")
local reloadAnim = animations:WaitForChild("Reload")
local holdAnim = animations:WaitForChild("Hold")

--//Animation Tracks\\--
local recoilTrack
local reloadTrack
local holdTrack

--//Configs\\--
local allowTracing = configs:WaitForChild("AllowTracing")
local range = configs:WaitForChild("Range")

--//Remotes\\--
local canShoot = remotes:WaitForChild("CanShoot")
local canReload = remotes:WaitForChild("CanReload")
local hitRemote = remotes:WaitForChild("Hit")
local reloadRemote = remotes:WaitForChild("Reload")
local shootRemote = remotes:WaitForChild("Shoot")

--//Assets\\--
local flashGui = hole:WaitForChild("FlashGui")

--//Bindables\\--
local reloadBind = bindables:WaitForChild("Reload")

--//Functions\\--
local function equip()
    equipped = true

    --//Get humanoid
    local character = player.Character or player.CharacterAdded:Wait()
    local humanoid = character:WaitForChild("Humanoid")

    if humanoid then
        --//Load animations
        pcall(function()
            --//Hold animation
            holdTrack = humanoid:LoadAnimation(holdAnim)
            holdTrack:Play()
        end)

        pcall(function()
            --//Reload animation
            reloadTrack = humanoid:LoadAnimation(reloadAnim)
        end)

        pcall(function()
            --//Recoil animation
            recoilTrack = humanoid:LoadAnimation(recoilAnim)
        end)
    end
end

local function unequip()
    equipped = false

    --//Stop animations
    if holdTrack then
        holdTrack:Stop()
    end

    if reloadTrack then
        reloadTrack:Stop()
    end

    if recoilTrack then
        recoilTrack:Stop()
    end
end

local function reload()
    if canReload:InvokeServer() then
        --//Reload
        reloadRemote:FireServer()

        if reloadTrack then
            reloadTrack:Play()
        end
    end
end

local function fire()
    --//Checks
    if canShoot:InvokeServer() then
        --//Initialize
        if recoilTrack then
            recoilTrack:Play()
        end
        flashGui.Enabled = true

        --//Cast ray
        local ray = Ray.new(hole.CFrame.p, (mouse.hit.p - hole.CFrame.p).unit * range.Value)
        local touch, position = workspace:FindPartOnRay(ray, player.Character, false, true)

        --//Hit detection
        if touch then
            hitRemote:FireServer(touch)
        end
        shootRemote:FireServer()

        --//Trace
        if allowTracing.Value then
            --//Create
            local trace = Instance.new("Part")
            trace.Anchored = trace
            trace.CanCollide = false
            trace.Transparency = 0.5
            trace.BrickColor = BrickColor.new("Bright yellow")
            trace.Material = Enum.Material.SmoothPlastic

            --//Calculate
            local distance = (hole.CFrame.p - position).magnitude
            trace.Size = Vector3.new(0, 0, distance)
            trace.CFrame = CFrame.new(hole.CFrame.p, position) * CFrame.new(0, 0, -distance/2)
            trace.Parent = workspace

            --//Clean-up
            game:GetService("Debris"):AddItem(trace, 0.1)

            wait(0.1)

            flashGui.Enabled = false
        end
    end
end