These budget aluminum rail sections seem sturdy and really hooked up solidly to my AR. Although not as light as their magpul polymer counterparts they seem more rugged and sturdy. The 13 slot rail has 2 screws just like the smaller ones, but the AIM rail I have has 3. The large rail did seem very secure with the 2 screws though. From what I see in my initial set up, I’d most likely recommend them to anyone.
When I removed the rails from the hand guard there were no scratches or marks left behind.