Shooting through walls?

Okey so i made this gun that works fine but the only problem is that the bullets goes through walls and thats kinda annoying

Player = game.Players.LocalPlayer
Gun = script.Parent
firespeed = 0.07
Reloadtime = 1.5
Ammo = 30
spareammo = 300
mouse = Player:GetMouse()
Dmg = math.random(20,25)
enabled = true

Gun.Equipped:connect(function()
    script.Parent.GripForward = Vector3.new(0,-150,1)
end)

function shoot()
    if Ammo > 0 and enabled == true then
        enabled = false
        IsFiring = true
        Firing()
    end

end
function Firing()
    repeat
    function Damage(Part)
            if Part.Parent:FindFirstChild("Humanoid") ~= nil and Part.Parent.Name ~= Player.Name and game.Players:GetPlayerFromCharacter(Part.Parent).TeamColor ~= Player.TeamColor then
                Part.Parent.Humanoid.Health = Part.Parent.Humanoid.Health -Dmg
                Bullet:Destroy()
            end
        end
        Ammo = Ammo -1
        enabled = false
        Bullet = Instance.new("Part", workspace)
        Gun.GripPos = Vector3.new(-0.35,1.2,0)
        Bullet.Shape = "Ball"
        Bullet.Size = Vector3.new(0.2,0.2,0.2)
        Bullet.TopSurface = "Smooth"
        Bullet.BottomSurface = "Smooth"
        Bullet.BrickColor = BrickColor.new("Dark stone grey")
        Bullet.CFrame = Gun.Handle.CFrame +Vector3.new(0,0.35,0.4)
        Bullet.CFrame = CFrame.new(Bullet.Position,mouse.hit.p)
        Bullet.CanCollide = true
        BM = Instance.new("SpecialMesh", Bullet)
        BM.MeshType = "Sphere"
        BM.Scale = Vector3.new(0.2,0.2,0.2)
        v = Instance.new("BodyVelocity", Bullet)
        v.velocity = Bullet.CFrame.lookVector *250
        v.maxForce = Vector3.new(math.huge,math.huge,math.huge)
        Sound = Instance.new("Sound", Bullet)
        Sound.SoundId = "http://www.roblox.com/asset/?id=132455948"
        RP = math.random(60,80)
        RP = RP/10
        Sound.Pitch = RP
        RV = math.random(70,90)
        RV = RV/10
        Sound.Volume = RV
        Sound:Play()
        Bullet.Touched:connect(Damage)
        game.Debris:AddItem(Sound, 2)
        wait(firespeed)
        Gun.GripPos = Vector3.new(-0.3,1,0)
        wait()
        enabled = true
    until IsFiring == false or Ammo == 0
end
function stopshooting()
    IsFiring = false
end
function reload(key)
    key:lower()
    if key == "r" then
        game.Players.LocalPlayer.PlayerGui.weapongui.ReloadingLabel.Visible = true
        spareammo = spareammo - Ammo
        print("Reloading")
        IsFiring = false
        wait(Reloadtime)        
        if spareammo > 29 then
            Ammo = 30
        elseif spareammo < 30 and spareammo > 0 then
            Ammo = spareammo
        elseif spareammo == 0 then
            Ammo = 0
        end
        game.Players.LocalPlayer.PlayerGui.weapongui.ReloadingLabel.Visible = false

    end
end


mouse.KeyDown:connect(reload)
Gun.Deactivated:connect(stopshooting)
Gun.Activated:connect(shoot)