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Careful though. Some really cheap ones are made in China for airsoft and I don't know how well they will hold up to the recoil of real guns. You must be thinking, "oh they are just metal. What could possibly happen?" The nuts and bolts could be of sub-standard quality and, let's say you mounted the rail to the bottom of your handguard and mounted a foregrip to it, the recoil from the firearms could slowly but surely strip the thread of the nut.
I am speaking from experience. Before I got involved with real guns, I play airsoft. One of my first purchase was a made-in-China grip-pod. The thread of the bolt was stripped smooth after I tighten it a few times. Fortunately, local hardware stores have a set of $0.50 nuts of bolts that works perfectly on the grip-pod.