Bullet Spread on Projectile Weapons?

This is my first question on this site, I making a Projectile based gun and it is way too accurate so I want to add bullet spread but I can't get it to work. Where do I put the bullet spread part?

I'm pretty sure this is the full function

function isFiring()
	repeat
	local Bullet = Instance.new("Part",workspace)
	ammo=ammo-1
	print(ammo)
	function onTouched(hit)
	if hit.Parent.Name==(player.Name) then
	hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health - Damage*0
	elseif hit.Name == "Head" then
	hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health - Damage*2
	Bullet:Destroy()
	elseif hit.Name == "Torso" then
	hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health - Damage*1
	Bullet:Destroy()
	elseif hit.Name == "Right Leg" then
	hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health - Damage*0.5
	Bullet:Destroy()
	elseif hit.Name == "Left Leg" then
	hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health - Damage*0.5
	Bullet:Destroy()
	elseif hit.Name == "Right Arm" then
	hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health - Damage*0.5
	Bullet:Destroy()
	elseif hit.Name == "Left Arm" then
	hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health - Damage*0.5
	Bullet:Destroy()
	elseif hit:IsA("Hat") then
	hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health - Damage*math.random(0.25,2)
	Bullet:Destroy()
	end
	end
	if ammo == 0 or Reloading then
		Firing=false
	end
	--Bullet--
	game.Debris:AddItem(Bullet,1)
	Bullet.Name= "Bullet"
	Bullet.CanCollide= false
	Bullet.Shape = "Block"
  	Bullet.Material = "Neon"
  	Bullet.BrickColor = BrickColor.new ("Bright yellow")--Colour--
	Bullet.Size=Vector3.new (0.1,0.1,2.5)--Size--
	Bullet.CFrame = Barrel.CFrame*CFrame.new(0,0,0)--Where--
	Bullet.CFrame= CFrame.new(Bullet.Position,mouse.hit.p)
	local Velo = Instance.new ("BodyVelocity",Bullet)
	Velo.velocity =  Bullet.CFrame.lookVector*200--Speed of Bullet--
	Velo.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
	Bullet.CustomPhysicalProperties = PhysicalProperties.new(0.01,0,0,0,0)	
	local weld =Instance.new("Weld",Bullet)
	weld.C0= Bullet.CFrame:inverse()*Bullet.CFrame
	weld.Part0=Bullet
	weld.Part1=Bullet
	local a0 = Instance.new("Attachment")
   	a0.Parent = Bullet
   	a0.Position = Vector3.new(0,.5,0)
   	a0.Name = "Trail Attachment 0"
   	local a1 = Instance.new("Attachment")
   	a1.Parent = Bullet
   	a1.Position = Vector3.new(0,-.5,0)
   	a1.Name = "Trail Attachment 1"
   	local trail = Instance.new("Trail")
    trail.Parent = Bullet
    trail.Attachment0 = a0
    trail.Attachment1 = a1
   	trail.Transparency = NumberSequence.new(0.5,1)
   	trail.WidthScale=NumberSequence.new(0.1,0.1)
	trail.Color = ColorSequence.new(Color3.new(205,150,0))
    trail.LightEmission=0.75
	trail.Lifetime = 0.5
	Bullet.Touched:Connect(onTouched)
	wait(.075)--FireRate--
	enabled= true
	--Bullet--
	until Firing == false or Ammo == 0
end