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