Installation is simple if you have a rail. A single cross bolt holds it on, but it is solid. The crossbolt has a semi-captured nut on the other side. The nut shape is molded into the handguards, but if you take the crossbolt out completely the nut comes out (isn't molded in). That grip is going nowhere...unlike some of the vertical grips I've seen. It is made out of the high impact polymer like their mags, so good luck breaking it. The design is actually two molded halves which allows you to modify the grip slightly. There are two cap head screws that hold the halves together and do nothing to hold the grip on the rail. Thus, under the one cross bolt and the grip comes off, but stays in one piece. Good design.
By taking the halves apart you can swap a small grip; either small ridges or a large finger separating ridge.
Image from manufacturer showing large ridge:
My image showing the small ridge piece installs (smooth, but with grip essentially). I prefer this insert.
Additionally, the AFG has a hand stop. This is to keep your hand from sliding forward and touching the hot gas tube. I like it, but sort of like the feel of wrapping my pointer finger around it. Really pulls the rifle into the shoulder with no effort.
Here is a picture showing how to use it. It is very natural.
Manufacturers sight: http://store.magpul.com/product/MAG411/100
