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After trying to figure out how I could arrange optics, lights, and other tacticool goodies on my SRU "gPup", I decided that more could be done with the front end. This is a direct replacement for the plug in front of the trigger that is held in place by a single pin. This will allow you to place any number of items, including: lights, lasers, vertical grips, and even small shotgun shell style grenade launchers right under the barrel.
While they will fit, it IS NOT recomended that this be used for foregrips until proper stress testing can be done. It could be a lot of stress on a small part not originally intended to do anything. (After receiving the product, I an ALMOST confidently say that it will easily hold a grip, but I won't say for sure until I have used one for a considerable amount of time.)
Currently, I am only seeling the part in black, but I see no reason why it wouldn't work in any of the other strong and flexible colors. Feel free to send a note and ask if you want something specific. Some filing may be required. I tried to make it a HAIR bigger where I could to combat some of the wobble from the stock part.