[SOLVED] How would I add a gun flash to my gun?

I am making a gun in ROBLOX, (working well so far), but to make it look even better. I wanted to add a gun flash effect. How would I do it? If you need the code; read below:

Code:

Ammo = 45

damage = 11

AbleToFire = true

isFiring = true

Player = game:GetService("Players").LocalPlayer
mouse = Player:GetMouse()
mouse.TargetFilter = Player.Character

script.Parent.Equipped:connect(function(eventMouse)
mouse.KeyDown:connect(function(Key)
	if Key == "r" then	
if Ammo <= 44 then
if AbleToFire then
	AbleToFire = false
	
	AbleToFire = false
script.Parent.ReloadSound:Play()
local ReloadAnim = script.Parent.ReloadAnimation
PlayAnim2 = Player.Character.Humanoid:LoadAnimation(ReloadAnim)
PlayAnim2:Play()
wait(1.986)
		PlayAnim2:Stop()		
	Ammo = 45
			Player.PlayerGui.ScreenGui3.Ammo.Value = 45
			AbleToFire = true
end
end
end
end)	
local Weld = script.Parent.GunWeld
PlayAnim = Player.Character.Humanoid:LoadAnimation(Weld)
PlayAnim:Play()	
	Player:WaitForChild("PlayerGui").ScreenGui3.Frame.Visible = true
	eventMouse.Icon = "rbxasset://textures\\GunCursor.png"
end)

script.Parent.Unequipped:connect(function()
	Player:WaitForChild("PlayerGui").ScreenGui3.Frame.Visible = false
PlayAnim:Stop()
PlayAnim2:Stop()
end)

script.Parent.Activated:connect(function()
isFiring = true
repeat wait(.0750)
	if Ammo > 0 and AbleToFire == true then
Ammo = Ammo - 1
Player.PlayerGui.ScreenGui3.Ammo.Value = Player.PlayerGui.ScreenGui3.Ammo.Value - 1
script.Parent.FireSound:Play()
local ray = Ray.new(script.Parent.Handle.CFrame.p, (mouse.Hit.p - script.Parent.Handle.CFrame.p).unit * 300)
local part, position = workspace:FindPartOnRay(ray, Player.Character, false, true)
Bullet = Instance.new("Part", workspace)
Bullet.CanCollide = true
Bullet.BrickColor = BrickColor.new("New Yeller")
Bullet.FormFactor = "Custom"
Bullet.Material = "Neon"
Bullet.CanCollide = false
Bullet.Anchored = true
Bullet.Locked = true
Bullet.Transparency = 0
Bullet.Name = "M4A1Bullet"

local distance = (script.Parent.Handle.CFrame.p - position).magnitude
Bullet.Size = Vector3.new(.0500, .0500, distance)
Bullet.CFrame = CFrame.new(script.Parent.Handle.CFrame.p, position) * CFrame.new(0, 0, -distance / 2)

game:GetService("Debris"):AddItem(Bullet, 0.1)

if part then
	local humanoid = part.Parent:FindFirstChild("Humanoid")
	
	if not humanoid then
		part.Parent.Parent:FindFirstChild("Humanoid")
	end

if humanoid then
	humanoid:TakeDamage(damage)
end

script.Parent.GripPos = Vector3.new(0.15, -0.4, -0.5)
wait(0)
script.Parent.GripPos = Vector3.new(0.15, -0.35, -0.5)

end
end
until isFiring == false or Ammo == 0
end)



script.Parent.Deactivated:connect(function()
	isFiring = false
end)