I was also thinking a UTG grip from amazon for $12 and then buying a separate bipod. On Amazon UTG gets great reviews but on some forums, it seems like they are intended only for airsoft or 22s. I want to be able to use my accessories on the 15-22 and a regular AR.
I have a UTG fore grip. I like mine. It has a very solid mount. I have not shot it on my 5.56, but see no reason not to?
Don't know what some of the soldiers are running in the Sand box, or Mountains. But in the States I think a UTG is fine for the 5.56mm platform.