My fps gun not doing any DAMAGE, is there a reason why?

So basically, I made my first fps gun!!! Then, when I tested it, it did no damage to anyone. When I tried fps guns from toolbox, it also did no damage. Games like arsenal have this, but I'm unsure how to make it so you can hit people.

----------------------------------------------------------------------
--------------------[ IGNORE MODEL HANDLING ]-------------------------
----------------------------------------------------------------------

wait(math.random(0, 20) / 40) --This is to prevent more than one ignoreModel from being created

if _G.ignoreCode then --If the ignoreCode already exists, then the script creates the ignoreModel
	--[[
		The purpose of this is so that every gun in a game that uses this gun kit will share one ignoreModel. That way,
		bullet trails, bullet holes, and other fake arms will be ignored by the gun which makes the bullets more likely to
		hit a character part
	--]]
	if (not game.Workspace:FindFirstChild("ignoreModel_".._G.ignoreCode)) then
		local ignoreModel = Instance.new("Model")
		ignoreModel.Name = "ignoreModel_".._G.ignoreCode
		ignoreModel.Parent = game.Workspace
		
		local grenadeFolder = Instance.new("Model")
		grenadeFolder.Name = "grenadeFolder"
		grenadeFolder.Parent = ignoreModel
	
		spawn(function()
			while true do
				ignoreModel.Parent = game.Workspace
				grenadeFolder.Parent = ignoreModel
				wait(1 / 20)
			end
		end)
	end
	
	script.Parent:WaitForChild("clientMain"):WaitForChild("ignoreCode").Value = _G.ignoreCode
else
	--[[
		If there isn't already an ignoreCode, then this creates one. The purpose of it being random is so that if there is
		an ignoreModel for something else in the game, the script won't end up placing the ignored objects in that ignoreModel
	--]]
	_G.ignoreCode = math.random(1, 1e4)
	
	if (not game.Workspace:FindFirstChild("ignoreModel_".._G.ignoreCode)) then
		local ignoreModel = Instance.new("Model")
		ignoreModel.Name = "ignoreModel_".._G.ignoreCode
		ignoreModel.Parent = game.Workspace
		
		local grenadeFolder = Instance.new("Model")
		grenadeFolder.Name = "grenadeFolder"
		grenadeFolder.Parent = ignoreModel
	
		spawn(function()
			while true do
				ignoreModel.Parent = game.Workspace
				grenadeFolder.Parent = ignoreModel
				wait(1 / 20)
			end
		end)
	end
	
	script.Parent:WaitForChild("clientMain"):WaitForChild("ignoreCode").Value = _G.ignoreCode
end

spawn(function()
	--[[
		This function deletes any Player Folders that were left in the ignoreModel because the player left the game without
		deselecting the Gun first
	--]]
	repeat wait() until _G.ignoreCode
	local ignoreModel = game.Workspace:WaitForChild("ignoreModel_".._G.ignoreCode)
	while true do
		for _, gunIgnore in pairs(ignoreModel:GetChildren()) do
			if gunIgnore.Name ~= "grenadeFolder" then
				if (not game.Players:FindFirstChild(gunIgnore.Name:sub(11))) then
					gunIgnore:Destroy()
				end
			end
		end
		wait(1 / 20)
	end
end)

----------------------------------------------------------------------
--------------------[ RESET CAMERA ]----------------------------------
----------------------------------------------------------------------

Gun.ChildRemoved:connect(function(Child)
	if Child == Handle and Plyr.Value then
		local ignoreCode = Gun:WaitForChild("clientMain"):WaitForChild("ignoreCode").Value
		local resetCam = script:WaitForChild("resetCam")
		resetCam:WaitForChild("ignoreCode").Value = ignoreCode
		resetCam.Parent = Plyr.Value.PlayerGui
	end
end)

----------------------------------------------------------------------
--------------------[ GET WELD CFRAMES ]------------------------------
----------------------------------------------------------------------

for _, v in pairs(Gun:GetChildren()) do
	if v:IsA("BasePart") and v ~= Handle then
		if v:FindFirstChild("mainWeld") then v.mainWeld:Destroy() end
		if (not v:FindFirstChild("weldCF")) then
			local weldCF = Instance.new("CFrameValue")
			weldCF.Name = "weldCF"
			weldCF.Value = Handle.CFrame:toObjectSpace(v.CFrame)
			weldCF.Parent = v
		end
		if string.sub(v.Name, 1, 3) == "Mag" then
			if (not v:FindFirstChild("magTrans")) then
				local magTrans = Instance.new("NumberValue")
				magTrans.Name = "magTrans"
				magTrans.Value = v.Transparency
				magTrans.Parent = v
			end
		end
		v.Anchored = true
		v.CanCollide = false
	end
end
Handle.Anchored = false
Handle.CanCollide = true

----------------------------------------------------------------------
--------------------[ GUNSETUP HANDLING ]-----------------------------
----------------------------------------------------------------------
---------------------------------------
--Ommited due to lenght----
--------------------------------------
----------------------------------------------------------------------
--------------------[ TWEENJOINT HANDLING ]---------------------------
----------------------------------------------------------------------

local createTweenIndicator = script:WaitForChild("createTweenIndicator")
function createTweenIndicator.OnServerInvoke(_, Joint, newCode)
	local tweenIndicator = nil
	if (not Joint:findFirstChild("tweenCode")) then --If the joint isn't being tweened, then
		tweenIndicator = Instance.new("IntValue")
		tweenIndicator.Name = "tweenCode"
		tweenIndicator.Value = newCode
		tweenIndicator.Parent = Joint
	else
		tweenIndicator = Joint.tweenCode
		tweenIndicator.Value = newCode --If the joint is already being tweened, this will change the code, and the tween loop will stop
	end
	return tweenIndicator
end

local lerpCF = script:WaitForChild("lerpCF")
function lerpCF.OnServerInvoke(_, Joint, Prop, startCF, endCF, Alpha)
	spawn(function()
		Joint[Prop] = startCF:lerp(endCF, Alpha)
	end)
end

local deleteTweenIndicator = script:WaitForChild("deleteTweenIndicator")
function deleteTweenIndicator.OnServerInvoke(_, tweenIndicator, newCode)
	if tweenIndicator.Value == newCode then --If this tween functions was the last one called on a joint then it will remove the code
		tweenIndicator:Destroy()
	end
end

----------------------------------------------------------------------
--------------------[ BULLET IMPACT HANDLING ]------------------------
----------------------------------------------------------------------

local createBulletImpact = script:WaitForChild("createBulletImpact")
createBulletImpact.OnServerEvent:connect(function(_, H, P, N, D, humanoidFound, gunIgnore, S)
	local surfaceCF = CF(P, P + N)
	----------------------------------------------------------------------------------
	--Creating the bullet hole--------------------------------------------------------
	----------------------------------------------------------------------------------
	if S.bulletHoles and (not humanoidFound) then
		local Hole = Instance.new("Part")
		Hole.Transparency = 1
		Hole.Anchored = true
		Hole.CanCollide = false
		Hole.FormFactor = "Custom"
		Hole.Size = V3(1, 1, 0.2)
		Hole.TopSurface = 0
		Hole.BottomSurface = 0
		local Mesh = Instance.new("BlockMesh")
		Mesh.Offset = V3(0, 0, -0.05)
		Mesh.Scale = V3(S.holeSettings.Size, S.holeSettings.Size, 0)
		Mesh.Parent = Hole
		local Decal = Instance.new("Decal")
		Decal.Face = Enum.NormalId.Front
		Decal.Texture = S.holeSettings.Texture
		Decal.Parent = Hole
		Hole.Parent = gunIgnore
		Hole.CFrame = surfaceCF
		if (not H.Anchored) then
			local Weld = Instance.new("Weld", Hole)
			Weld.Part0 = H
			Weld.Part1 = Hole
			Weld.C0 = H.CFrame:toObjectSpace(surfaceCF)
			Hole.Anchored = false
		end
		delay(S.holeSettings.visibleTime, function()
			if S.holeSettings.disappearTime > 0 then
				local t0 = tick()
				while true do
					local Alpha = math.min((tick() - t0) / S.holeSettings.disappearTime, 1)
					Decal.Transparency = numLerp(0, 1, Alpha)
					if Alpha == 1 then break end
					wait()
				end
				Hole:Destroy()
			else
				Hole:Destroy()
			end
		end)
	end