A perfect circle: micro, lightweight, robust and it works. - Griffin Armament M2 Micro Modular Rear Sight

The single flip up sight peep hole is perfect for my vision. The semi hooded peep sight reduces shadows and reflected/ refracted light. The front and rear are flat and not convex. Seems to encircle my round hooded HK style front sight very well (PRI or Troy).
I can still pass for 20/20 vision but my eyes these days are picky. I played with 10-15” distances between front and rear sights and this was the best option for me.
The steel metal tab protects the receiver from the tensioning screw if not over-tightened. It does take more effort to raise it because of its size/ reduced gripping surface (somewhat like the slide on a small CZ pistol).
Rear sights can clutter red dot sights. This one does not. It’s a true minimalist design and does not feel flimsy.
This little sight is on my go to Ar15. PRI flip up front sight and a Holosun 510C Red Dot. Works well with the Troy HK style flip up as well. Great for my civilian AR needs and wants.