My favorite handguard on the planet - bar none. - Aero Precision AR15 ATLAS S-ONE M-LOK Handguard

The S-One is my all-time favorite handguard. In particular, I like the nice round/smooth contour where my hand wraps around the handgaurd. I don't know why other manufacturers don't do theirs the way this one is, with picatanny rail only at the front and rear, and smooth in the middle. I don't know about you, but I have never once mounted anything on a 12 oclock picatinny rail in the middle of the handguard - it's either like a front sight or somesuch I mount at the far end, or if I trust the mounting system of the handguard (and I trust the one on the S-One), the front scope ring of a LPVO at the back end. So in my view, the full length picatinny rail that most handguards come with is a waste, and uncomfortable to wrap my hand around to boot. The S-One gets it right with the smooth contours in the middle where I wrap my hand around it.

I also like the lockup method, I find it very solid, much better than just the simple "clamp-on" type handguards.

And last, but certainly not least, I love the weight (or lack thereof) on these handguards. These are almost as light as the ultra-light handguards from other manufacturers that sell for twice as much (or more).

As my budget allows, I am slowly going through the process of converting all my guns to these handguards. I like them that much. Unfortunately, everyone else does too and so the price on these keeps creeping up (they were around $100 when they were first introduced) - but they are still pretty affordable compared to other handguards that I would consider of comparable quality (BCM, Larue, etc).