If you pull up the Maryland Shooters forum sight,,, there are some guys there that do all kinds of "Do It Yourself" projects to ARs...
I picked up a couple of tips on mounting a flashlight to a M4 Carbine at almost no cost....There is probably one for mounting a handle there as well...
It's a Surefire with the on/off button switch in the end cap..works great with your thumb.. You can mount it to normal hand guard as well from their instructions...
With the DPMS standard hand guards, there is a heat shield under some of them that you need to attach to and pulling them off is not a big problem...
