Buy this one - FAB Defense Rubber Overmolded Ergonomic Foregrip

I had been looking for a vertical grip for a while but had a problem with the prices and what you get in the end. I seen the FAB Defense it was a great color and just like the others hade a great mounting solution. However upon receiving the grip that's when I realized that I had made the right choice. This grip comes not only with the grip but an offset mount that attaches to the grip to mount a flashlight and pressure pad. You can use just the grip or you can setup your light right on the grip. This is a great all in one solution to grip and light setup. Definitely give this a look if you are wanting a vertical grip. I also almost forgot it also comes with an additional extension remove the lower cap screw in the extension and it adds like another inch. I would definitely buy again if and when I have the need!!