Super solid/durable rail, great price, only downside is a bit heavy - AIM Sports Inc AR-15/M4 Handguard/Quad Rail

This rail is solid as a rock once it's installed, and very heavy duty. I would have no qualms about mounting anything you can mount to a rail using this rail. I think if you battered one of the accessories hard enough to dislodge it from the rail, the rail will still be attached and unmoved. It is the same basic design as the very expensive KAC quad rail that is used by the US military. To be fair, I would be confident the KAC is made of higher grade materials, is better finished, and has better QC, but the fundamental "how does it work" is identical as far as I can tell.

The reviews saying it is hard to install are Doing it Wrong(tm). You simply align place the rear of the handguard into the barrel nut and press it back against the delta ring until it is far enough in for the front of the handguard to snap into place around the handguard cap. Repeat with the other half, and then screw the halves together with a reasonable amount of torque (I did mine to the German Standard (good-and-tight), which I'd guess was probably around 40-50 inch pounds. Blue loc-tite recommended if you're going to put it on a hard use gun.

The only downside I can see to this rail, is the weight - it came in at 12.7 oz on my kitchen scale (vs 5 to 6 for a typical carbine handguard), so you'll be adding almost half a pound to your gun. But to make it lighter, you'd have to remove material, and then you'd end up with a less heavy duty handguard - such is life.