How do I make this not go through objects?

So I'm making a gun where the trail shows where the player shot, but the issue is that it goes through the object/walls and it can be seen on the other side. How can I make the trail decrease its 'Z Size' as if its going through the wall but its really just decreasing its Z size?

local ray = Ray.new(FakeTip.CFrame.p, (MousePos - FakeTip.CFrame.p).unit*Range)
    local Part, Pos = game.Workspace:FindPartOnRayWithIgnoreList(ray, {Char, Tool, FakeHandle, FakeTip})
    local HumanoidCheck = FindHuman(Part)
    local Beam = Instance.new('Part')
    local Beam_Mesh = Instance.new('SpecialMesh')
    Beam_Mesh.MeshType = Enum.MeshType.Sphere
    Beam_Mesh.Scale = Vector3.new(1, 2, 1)
    Beam.Material = Enum.Material.Neon
    Beam.BrickColor = BrickColor.new('Daisy orange')
    Beam.CanCollide = false
    Beam.Anchored = true
    Beam.Size = Vector3.new(.2, .2, (FakeTip.CFrame.p - Pos).magnitude)
    Beam.CFrame = CFrame.new(FakeTip.CFrame.p, Pos) * CFrame.new(0, 0, -((FakeTip.CFrame.p - Pos).magnitude)/2)
    Beam_Mesh.Parent = Beam
    Beam.Parent = workspace
    local TrailSpeed = 15 -- 15
    local Mag = (FakeTip.CFrame.p - Pos).magnitude
    local ZDelta = Mag/100

Here's what I mean, Below

spawn(function()
        for i = 0, 1, .1 do 
            Beam.Transparency = i+.15
            Beam_Mesh.Scale = Vector3.new(Beam_Mesh.Scale.X *.8, Beam_Mesh.Scale.Y *.85, Beam_Mesh.Scale.Z *1.02)
            Beam.CFrame = Beam.CFrame*CFrame.new(0, 0, -Beam.Size.Z*Mag/100)
            wait(.05)
        end
    end)