Adding a single Rail to an AR
I am just about to order my first AR. The model that I am buying, the S&W 15OR comes with a standard hand guard. I would like to add a single rail under the hand guard to make use of a forward handle and or bi-pod.
Do I have any options to buy a single Rail that can attach to the stock hand guard, or do I have to buy the whole Quad Rail hand guard replacement?