how to use lookVector when Raycasting?

I have trouble with this, because i am making an Enemy AI, that will shoot projectiles the way i plan to do this is by making a fake mouse, for the AI so i thought Raycasting will work, though it does not seem to as it will only shoot in one direction, or ofcourse if you guys have any better way to do this without raycasting that will be nice, but here is the script

gundb = false
attack = false
chr = script.Parent
guncool = 3
gundur = 0.4
gundamage = 10

local GUN_RANGE = 1000
local torso = chr.Torso
local fmousegun = Ray.new(torso.Position, torso.CFrame.lookVector * GUN_RANGE)

lookAt = (fmousegun.Direction - chr.HumanoidRootPart.CFrame.lookVector).unit	


gunshot = function()
	if gundb == false then
		gundb = true
		attack = true
		
		chr.EnemyHumanoid.WalkSpeed = 0
		chr.EnemyHumanoid.JumpPower = 0
	
	
local rayend, endPoint = workspace:FindPartOnRay(fmousegun)	
	print(rayend)

	local arrow = game.ReplicatedStorage.Enemys.Act1.TroubleMakers.Bullet:clone()
	arrow.BodyVelocity.Velocity = lookAt*(100*1)
	arrow.Damage.Disabled = false	
	arrow.Parent = workspace
	arrow.CFrame = CFrame.new(lookAt * 5)
	arrow.BodyGyro.CFrame = CFrame.new(arrow.CFrame.p,fmousegun.Direction)
	game.Debris:AddItem(arrow,5)		
wait(gundur)	
attack = false	
		chr.EnemyHumanoid.WalkSpeed = 16
		chr.EnemyHumanoid.JumpPower = 50	
wait(guncool)

gundb = false
	
		
		
	end
end





while true do
	wait(2)
	fmousegun = Ray.new(torso.Position, torso.CFrame.lookVector * GUN_RANGE)
	local attacks = 1
	
	if attacks == 1 and attack == false then
		print("shot")
		gunshot()
	end
end