Projectile is not very accurate? [UNSOLVED]

While I was testing a paintball gun, I noticed that the projectile would sometimes not be directly aligned with the mouse, yet, with other guns with basically the same code, the projectile is fine. Can somebody please take a look at the code and see if there is something preventing it from being accurate?

local Torso = script.Parent.Parent.Torso
	local spawnPos = script.Parent.Barrel.Position -- Where to spawn the Bullet
-- more code for bullet
if aiming == false then
	bullet.Velocity = v * 500
	--[[local x, y, z = bullet.Velocity.x, bullet.Velocity.y, bullet.Velocity.z
		x = x + inaccuracyx
		y = y + inaccuracyy
		z = z + inaccuracyz
		bullet.Velocity = Vector3.new(x, y, z)]]--
	end
local bf = Instance.new("BodyForce", bullet)
	bf.force = Vector3.new(0, 100, 0)
local character = script.Parent.Parent
	local humanoid = character.Humanoid
	local targetPos = humanoid.TargetPoint -- Find where the humanoid is targeting
		local lookAt = (targetPos).unit -- Find where the humanoid is targeting
		local ammo = script.Parent.Ammo
		if ammo.Value <= 0 then
			script.Parent.Handle.GunEmptySound:Play()
			enabled.Value = false
			update()
		end
		if canfire == false then
			enabled.Value = false
		return end
		if canfire == true then
		if ammo.Value > 0 then
			ammo.Value = ammo.Value - 1
			
fire(lookAt)
script.Parent.Handle.FireSound:Play()
update()
wait(0.3)
enabled.Value = false