any sight that mounts on a loose removable dust cover is not worthwhile to me. IMHO
That looks like a good solution, too!For a Top Cover replacement, I would recommend the Dog Leg Gen 2
.Texas Weapon Systems, Dog Leg scope rail
It's much more secure as the top cover is secured through the rear sight (you remove the sight) and uses a special recoil spring assembly to further lock that top cover in place.
I had one but decided I liked the stock rear sight better (not much a fan of ghost ring sights) so I sold it. I'd probably get one again eventually.