How to tween in a certain direction?

Here is my code for a gun I want to tween the bullet to where it is facing. Anybody know how?

local player = game:GetService("Players").LocalPlayer
local mouse = player:GetMouse()
local tool = script.Parent

tool.Activated:Connect(function()
    --Set Up
    local bullet = Instance.new("Part")
    --Size
    bullet.Size = Vector3.new(0.27,0.25,1.49)
    --Anchored
    bullet.Anchored = true
    --Can/Can Not Collide
    bullet.CanCollide = false
    --Color
    bullet.BrickColor = BrickColor.new("Really red")
    --Matirial
    bullet.Material = Enum.Material.Neon
    --Parent
    bullet.Parent = workspace
    --Positon
    bullet.Position = tool.Handle.Position + Vector3.new(0,0.5,0)
    --Angle
    bullet.CFrame = CFrame.new(bullet.CFrame.p, mouse.Hit.p)

    --Movement
    local TweenService = game:GetService("TweenService")

    local info = TweenInfo.new(3, Enum.EasingStyle.Linear, Enum.EasingDirection.InOut, 0, false, 0)

    TweenService:Create(bullet, info, {Position = bullet.Position + Vector3.new(0,0,100)}):Play()

end)